MPEP § 2141.02 — Differences Between Prior Art and Claimed Invention (Annotated Rules)

§2141.02 Differences Between Prior Art and Claimed Invention

USPTO MPEP version: BlueIron's Update: 2026-01-10

This page consolidates and annotates all enforceable requirements under MPEP § 2141.02, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Differences Between Prior Art and Claimed Invention

This section addresses Differences Between Prior Art and Claimed Invention. Primary authority: 35 U.S.C. 102, 35 U.S.C. 103, and 37 CFR 2116.01. Contains: 2 requirements, 2 guidance statements, 1 permission, and 15 other statements.

Key Rules

Topic

Differences Between Claimed Invention and Prior Art

13 rules
StatutoryInformativeAlways
[mpep-2141-02-00f84887de989033badc081d]
Invention as a Whole Must Be Obvious
Note:
When comparing the prior art to the claims, the focus is on whether the entire claimed invention would have been obvious, not just the structural differences.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-c33773e287f511866b927a6d]
Claimed Invention Requires Single Integral Support Structure
Note:
The claimed invention must include a single integral and gaplessly continuous piece for the supporting means in a vibratory testing machine to be non-obvious over prior art.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-78fafefad7bf497cd788078b]
Inventive Concept Not Just Structural Differences
Note:
The claimed invention must not be deemed obvious based solely on structural differences from the prior art; the overall inventive concept, including novel functionalities or insights, must also be considered.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-0444210965d2c9963aacde2c]
Preamble Does Not Limit Claim Scope
Note:
The preamble of a claim does not limit the scope of the claim if it merely states the purpose of the process or product.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-16af6534f3401912f103048f]
Claims for Three-Step Processes Not Limited by Product Formed
Note:
Claims that encompass a three-step process, including an intermediate product step and final use step, are not limited to the product formed in the first two steps but cover the entire process.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-1e52f733b787907679a16259]
Preamble Does Not Limit Claim Scope
Note:
The preamble of a claim does not limit the scope of the claim unless it is essential to the patentability.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-c9550d9582218cd8327b5e8a]
Preamble Does Not Limit Claim Scope
Note:
The preamble of a claim does not limit the scope of the claimed process, even if it recites the purpose of the process.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-79235bd9e70a3a1e93d58b32]
Inherent Features Cannot Support Obviousness
Note:
Obviousness cannot be based on features that were not known at the relevant time, even if those features are later found to be inherent.

Obviousness cannot be predicated on what is not known at the relevant time, even if the inherency of a certain feature is later established. See In re Rijckaert, 9 F.3d 1531, 28 USPQ2d 1955 (Fed. Cir. 1993). See MPEP § 2112 for the requirements of rejections based on inherency.

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryRequiredAlways
[mpep-2141-02-8100c52c0a3d66ec02db6d43]
Prior Art Must Be Evaluated Entirely
Note:
A prior art reference must be considered in its entirety, including parts that may contradict the claimed invention.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtScope and Content of Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-7748dadfd46deb020391d384]
Prior Art Must Be Evaluated as a Whole
Note:
The prior art must be considered in its entirety, including parts that may contradict the claimed invention.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtGraham v. Deere FactorsScope and Content of Prior Art
StatutoryInformativeAlways
[mpep-2141-02-e059ffe7f74543c2dbb9432a]
Rapid Stretching of Highly Crystalline PTFE Not Suggested by Prior Art
Note:
The rule states that the prior art does not suggest rapidly stretching highly crystalline poly(tetrafluoroethylene) at a high rate, despite teaching slow stretching for unsintered PTFE.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtGraham v. Deere FactorsScope and Content of Prior Art
StatutoryRecommendedAlways
[mpep-2141-02-c00666deb864474949f0e946]
Differences Between Claimed Invention and Prior Art Must Be Considered
Note:
The rule requires that the differences between the claimed invention and prior art be considered in their entirety, including parts that may contradict or discourage the claimed method.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtGraham v. Deere FactorsScope and Content of Prior Art
StatutoryInformativeAlways
[mpep-2141-02-d4cf652136e6843930a18105]
Prior Art Must Be Evaluated as a Whole
Note:
The prior art reference must be considered in its entirety, including parts that may contradict the claimed invention.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceDifferences Between Claimed Invention and Prior ArtGraham v. Deere FactorsScope and Content of Prior Art
Topic

Scope and Content of Prior Art

5 rules
StatutoryInformativeAlways
[mpep-2141-02-13d723cd6c5371ffa6119286]
Claims Must Consider Invention Holistically, Not Just Structure
Note:
The claims must be evaluated based on the overall invention, not just structural differences from prior art.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceScope and Content of Prior ArtDifferences Between Claimed Invention and Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-2cb34d89aaea3aae8f625af8]
Inventor Eliminated Dampening Mechanisms Through Integral Design
Note:
The inventor's design eliminated the need for resonance dampening mechanisms by creating a single, gapless support structure, contrary to prior art expectations.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceScope and Content of Prior ArtDifferences Between Claimed Invention and Prior ArtGraham v. Deere Factors
StatutoryInformativeAlways
[mpep-2141-02-38c6b7fa9dd54fbf7bae6e9a]
Solution from Prior Art Not Always Patentable
Note:
A solution is not always patentable if it is obvious from prior art that contains the same solution for a similar problem.

“[A] patentable invention may lie in the discovery of the source of a problem even though the remedy may be obvious once the source of the problem is identified. This is part of the ‘subject matter as a whole’ which should always be considered in determining the obviousness of an invention under 35 U.S.C. § 103.” In re Sponnoble, 405 F.2d 578, 585, 160 USPQ 237, 243 (CCPA 1969). However, “discovery of the cause of a problem.. does not always result in a patentable invention…. [A] different situation exists where the solution is obvious from prior art which contains the same solution for a similar problem.” In re Wiseman, 596 F.2d 1019, 1022, 201 USPQ 658, 661 (CCPA 1979) (emphasis in original).

Jump to MPEP SourceScope and Content of Prior ArtObviousnessDifferences Between Claimed Invention and Prior Art
StatutoryInformativeAlways
[mpep-2141-02-c7cab36efedd71d2c4e4cf91]
Treatment Capacity Depends on Tank Volume to Contactor Area Ratio
Note:
The optimization parameter of tank volume to contactor area ratio was not recognized in prior art as a result-effective variable for maximizing treatment capacity.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Jump to MPEP SourceScope and Content of Prior ArtObviousness of Ranges and ValuesDifferences Between Claimed Invention and Prior Art
StatutoryRecommendedAlways
[mpep-2141-02-e4dc62c048144f753a135f4a]
Unsintered PTFE Should Be Stretched Slowly
Note:
The prior art indicates unsintered PTFE should be processed slowly, contradicting conventional rapid stretching methods.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceScope and Content of Prior ArtDifferences Between Claimed Invention and Prior ArtGraham v. Deere Factors
Topic

35 U.S.C. 103 – Obviousness

4 rules
StatutoryInformativeAlways
[mpep-2141-02-0548f253e5f2a25f43e72e4e]
Insight Not Obvious to Art
Note:
The structure implementing an unexpected insight would not have been obvious to those skilled in the art.

In determining the differences between the prior art and the claims, the question under 35 U.S.C. 103 is not whether the differences themselves would have been obvious, but whether the claimed invention as a whole would have been obvious. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983); Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983) (Claims were directed to a vibratory testing machine (a hard-bearing wheel balancer) comprising a holding structure, a base structure, and a supporting means which form “a single integral and gaplessly continuous piece.” Nortron argued the invention is just making integral what had been made in four bolted pieces, improperly limiting the focus to a structural difference from the prior art and failing to consider the invention as a whole. The prior art perceived a need for mechanisms to dampen resonance, whereas the inventor eliminated the need for dampening via the one-piece gapless support structure. “Because that insight was contrary to the understandings and expectations of the art, the structure effectuating it would not have been obvious to those skilled in the art.” 713 F.2d at 785, 218 USPQ at 700 (citations omitted).).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior ArtScope and Content of Prior Art
StatutoryInformativeAlways
[mpep-2141-02-f905539f9a7ff5c063b4b7a0]
Three-Step Process Involving Nonobvious and Obvious Steps
Note:
A process involving two nonobvious steps forming a known product and one obvious step is considered as a whole, with the overall process being nonobvious.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior ArtScope and Content of Prior Art
StatutoryRequiredAlways
[mpep-2141-02-f487487ff7b73634fde63470]
Invention as a Whole Must Be Delineated for Obviousness Determination
Note:
When determining if an invention is obvious under 35 U.S.C. 103, the entire invention must be considered, including both recited subject matter and inherent properties disclosed in the specification.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior ArtGraham v. Deere Factors
StatutoryPermittedAlways
[mpep-2141-02-0c0953dc1bcd3cfb0b84dffd]
Modification of Prior Art Does Not Invalidate Combination
Note:
The modification of prior art that may seem to invalidate the claimed invention does not necessarily negate its combination with other references due to simultaneous advantages and disadvantages.

A prior art reference must be considered in its entirety, i.e., as a whole, including portions that would lead away from the claimed invention. W.L. Gore & Assoc., Inc. v. Garlock, Inc., 721 F.2d 1540, 220 USPQ 303 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984) (Claims were directed to a process of producing a porous article by expanding shaped, unsintered, highly crystalline poly(tetrafluoroethylene) (PTFE) by stretching said PTFE at a 10% per second rate to more than five times the original length. The prior art teachings with regard to unsintered PTFE indicated the material does not respond to conventional plastics processing, and the material should be stretched slowly. A reference teaching rapid stretching of conventional plastic polypropylene with reduced crystallinity combined with a reference teaching stretching unsintered PTFE would not suggest rapid stretching of highly crystalline PTFE, in light of the disclosures in the art that teach away from the invention, i.e., that the conventional polypropylene should have reduced crystallinity before stretching, and that PTFE should be stretched slowly). Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016) (“Although modification of the movable blades may impede the quick change functionality disclosed by Caterpillar, ‘[a] given course of action often has simultaneous advantages and disadvantages, and this does not necessarily obviate motivation to combine.’” (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165, 77 USPQ2d 1865, 1870 (Fed Cir. 2006) (citation omitted))).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior ArtGraham v. Deere Factors
Topic

AIA vs Pre-AIA Practice

3 rules
StatutoryInformativeAlways
[mpep-2141-02-3d0709d3ff2dc4e63016ff8a]
Differences Between Prior Art and Claimed Invention
Note:
This rule outlines the differences between prior art and claimed invention under both AIA and pre-AIA practices.

[Editor Note: This MPEP section is applicable regardless of whether an application is examined under the AIA or under pre-AIA law. For applications subject to the first inventor to file (FITF) provisions of the AIA, the relevant time is "before the effective filing date of the claimed invention". For applications subject to pre-AIA 35 U.S.C. 102, the relevant time is "at the time of the invention". See MPEP § 2150 et seq. Many of the court decisions discussed in this section involved applications or patents subject to pre-AIA 35 U.S.C. 102. These court decisions may be applicable to applications and patents subject to AIA 35 U.S.C. 102 but the relevant time is before the effective filing date of the claimed invention and not at the time of the invention.]

Jump to MPEP SourceAIA vs Pre-AIA PracticeDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)
StatutoryInformativeAlways
[mpep-2141-02-2257bb1814f1e975825b5bd8]
Relevant Time for Pre-AIA Inventions
Note:
The relevant time for determining prior art under pre-AIA law is at the time of the invention.

[Editor Note: This MPEP section is applicable regardless of whether an application is examined under the AIA or under pre-AIA law. For applications subject to the first inventor to file (FITF) provisions of the AIA, the relevant time is "before the effective filing date of the claimed invention". For applications subject to pre-AIA 35 U.S.C. 102, the relevant time is "at the time of the invention". See MPEP § 2150 et seq. Many of the court decisions discussed in this section involved applications or patents subject to pre-AIA 35 U.S.C. 102. These court decisions may be applicable to applications and patents subject to AIA 35 U.S.C. 102 but the relevant time is before the effective filing date of the claimed invention and not at the time of the invention.]

Jump to MPEP SourceAIA vs Pre-AIA PracticeDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)
StatutoryInformativeAlways
[mpep-2141-02-8bd7a5c976fe1dfb2f3e3d99]
Court Decisions on Pre-AIA Patents
Note:
This rule discusses court decisions involving patents subject to pre-AIA 35 U.S.C. 102, which may be applicable to AIA cases but with different timeframes.

[Editor Note: This MPEP section is applicable regardless of whether an application is examined under the AIA or under pre-AIA law. For applications subject to the first inventor to file (FITF) provisions of the AIA, the relevant time is "before the effective filing date of the claimed invention". For applications subject to pre-AIA 35 U.S.C. 102, the relevant time is "at the time of the invention". See MPEP § 2150 et seq. Many of the court decisions discussed in this section involved applications or patents subject to pre-AIA 35 U.S.C. 102. These court decisions may be applicable to applications and patents subject to AIA 35 U.S.C. 102 but the relevant time is before the effective filing date of the claimed invention and not at the time of the invention.]

Jump to MPEP SourceAIA vs Pre-AIA PracticeDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)
Topic

Obviousness

3 rules
StatutoryRecommendedAlways
[mpep-2141-02-a2f515e363c3f4a9dae23ccc]
Discovery of Problem Source May Be Patentable
Note:
The discovery of the source of a problem can be patentable even if the solution is obvious, as part of the overall invention's subject matter under 35 U.S.C. § 103.

“[A] patentable invention may lie in the discovery of the source of a problem even though the remedy may be obvious once the source of the problem is identified. This is part of the ‘subject matter as a whole’ which should always be considered in determining the obviousness of an invention under 35 U.S.C. § 103.” In re Sponnoble, 405 F.2d 578, 585, 160 USPQ 237, 243 (CCPA 1969). However, “discovery of the cause of a problem.. does not always result in a patentable invention…. [A] different situation exists where the solution is obvious from prior art which contains the same solution for a similar problem.” In re Wiseman, 596 F.2d 1019, 1022, 201 USPQ 658, 661 (CCPA 1979) (emphasis in original).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior Art
StatutoryInformativeAlways
[mpep-2141-02-f0101f6d9abd36eb3ec22caf]
Applicant Must Prove Problem Discovery for Obviousness Challenge
Note:
Applicants challenging obviousness rejections must provide evidence, via affidavits or declarations, that they discovered the source of a problem and its solution.

Applicants who allege the inventor discovered the source of a problem must provide evidence substantiating the allegation, either by way of affidavits or declarations, or by way of a clear and persuasive assertion in the specification. In re Wiseman, 596 F.2d 1019, 201 USPQ 658 (CCPA 1979) (unsubstantiated statement of counsel was insufficient to show appellants discovered source of the problem); In re Kaslow, 707 F.2d 1366, 217 USPQ 1089 (Fed. Cir. 1983) (Claims were directed to a method for redeeming merchandising coupons which contain a UPC “5-by-5” bar code wherein, among other steps, the memory at each supermarket would identify coupons by manufacturer and transmit the data to a central computer to provide an audit, thereby eliminating the need for clearinghouses and preventing retailer fraud. In challenging the propriety of an obviousness rejection, appellant argued he discovered the source of a problem (retailer fraud and manual clearinghouse operations) and its solution. The court found appellant’s specification did not support the argument that he discovered the source of the problem with respect to retailer fraud, and that the claimed invention failed to solve the problem of manual clearinghouse operations.).

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior Art
StatutoryProhibitedAlways
[mpep-2141-02-c2f3b72030d866ed6b801d40]
Inherency Cannot Establish Obviousness
Note:
Obviousness cannot be based on features not known at the relevant time, even if their inherency is later established.

Obviousness cannot be predicated on what is not known at the relevant time, even if the inherency of a certain feature is later established. See In re Rijckaert, 9 F.3d 1531, 28 USPQ2d 1955 (Fed. Cir. 1993). See MPEP § 2112 for the requirements of rejections based on inherency.

Jump to MPEP SourceObviousnessDifferences Between Claimed Invention and Prior Art
Topic

Determining Whether Application Is AIA or Pre-AIA

2 rules
StatutoryInformativeAlways
[mpep-2141-02-ce8ceb4dfc36deab7624bd1f]
First Inventor to File Provision Before Effective Filing Date
Note:
The rule states that for applications subject to the first inventor to file provisions of the AIA, relevant prior art must be before the effective filing date of the claimed invention.

[Editor Note: This MPEP section is applicable regardless of whether an application is examined under the AIA or under pre-AIA law. For applications subject to the first inventor to file (FITF) provisions of the AIA, the relevant time is "before the effective filing date of the claimed invention". For applications subject to pre-AIA 35 U.S.C. 102, the relevant time is "at the time of the invention". See MPEP § 2150 et seq. Many of the court decisions discussed in this section involved applications or patents subject to pre-AIA 35 U.S.C. 102. These court decisions may be applicable to applications and patents subject to AIA 35 U.S.C. 102 but the relevant time is before the effective filing date of the claimed invention and not at the time of the invention.]

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)AIA vs Pre-AIA Practice
StatutoryPermittedAlways
[mpep-2141-02-387c99db973a021bf8df4a3e]
Time Frame for AIA and Pre-AIA Applications
Note:
Determines the relevant time period for applying court decisions to applications subject to AIA or pre-AIA 35 U.S.C. 102, focusing on the effective filing date rather than the invention's creation.

[Editor Note: This MPEP section is applicable regardless of whether an application is examined under the AIA or under pre-AIA law. For applications subject to the first inventor to file (FITF) provisions of the AIA, the relevant time is "before the effective filing date of the claimed invention". For applications subject to pre-AIA 35 U.S.C. 102, the relevant time is "at the time of the invention". See MPEP § 2150 et seq. Many of the court decisions discussed in this section involved applications or patents subject to pre-AIA 35 U.S.C. 102. These court decisions may be applicable to applications and patents subject to AIA 35 U.S.C. 102 but the relevant time is before the effective filing date of the claimed invention and not at the time of the invention.]

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)AIA vs Pre-AIA Practice
Topic

Implicit or Inherent Motivation

2 rules
StatutoryInformativeAlways
[mpep-2141-02-d7bf8bd4f6406c751760344a]
Invention as a Whole Includes Inherent Properties
Note:
When determining obviousness, the invention must include both literally recited subject matter and inherent properties disclosed in the specification.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Jump to MPEP SourceImplicit or Inherent MotivationPatent Application Content
StatutoryInformativeAlways
[mpep-2141-02-a698f15b599e24e9fbe27be9]
Invention as a Whole Includes Inherent Properties
Note:
The court found that the invention includes not just the literal claims but also inherent properties disclosed in the specification, such as maximizing treatment capacity regardless of other variables.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Jump to MPEP SourceImplicit or Inherent MotivationDifferences Between Claimed Invention and Prior Art
Topic

Payment Methods

1 rules
StatutoryRecommendedAlways
[mpep-2141-02-ca5ac50d21acc7a021c21ea2]
Preamble Does Not Limit Claim Scope
Note:
The preamble of a claim does not limit the scope of the claim, even if it describes the purpose of the process. The court held that the unobviousness of the first two steps in a three-step process makes the entire claimed process non-obvious.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourcePayment MethodsDifferences Between Claimed Invention and Prior ArtScope and Content of Prior Art
Topic

Level of Ordinary Skill in the Art

1 rules
StatutoryInformativeAlways
[mpep-2141-02-23fe087d5452fa5adf99ec5d]
Unobvious First Two Steps Make Whole Claim Nonobvious
Note:
If the first two steps of a claimed process are non-obvious, the entire claim is considered non-obvious even if subsequent steps are obvious.

See also In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976) (Claims were directed to a three step process for preparing sweetened foods and drinks. The first two steps were directed to a process of producing high purity maltose (the sweetener), and the third was directed to adding the maltose to foods and drinks. The parties agreed that the first two steps were nonobvious but formed a known product and the third step was obvious. The Solicitor argued the preamble was directed to a process for preparing foods and drinks sweetened mildly and thus the specific method of making the high purity maltose (the first two steps in the claimed process) should not be given weight, analogizing with product-by-process claims. The court disagreed and held “due to the admitted unobviousness of the first two steps of the claimed combination of steps, the subject matter as a whole would not have been obvious to one of ordinary skill in the art at the time the invention was made.” 535 F.2d at 69, 190 USPQ at 17 (emphasis in original). The preamble only recited the purpose of the process and did not limit the body of the claim. Therefore, the claimed process was a three-step process, not the product formed by two steps of the process or the third step of using that product.).

Jump to MPEP SourceLevel of Ordinary Skill in the ArtMaintenance Fee PaymentObviousness
Topic

Claims Directed To

1 rules
StatutoryRequiredAlways
[mpep-2141-02-bdce79f3319254c1a2cf2018]
Applicants Must Provide Evidence for Invented Problem Discovery
Note:
Applicants must submit evidence, through affidavits, declarations, or clear assertions in the specification, to substantiate claims that an inventor discovered the source of a problem.

Applicants who allege the inventor discovered the source of a problem must provide evidence substantiating the allegation, either by way of affidavits or declarations, or by way of a clear and persuasive assertion in the specification. In re Wiseman, 596 F.2d 1019, 201 USPQ 658 (CCPA 1979) (unsubstantiated statement of counsel was insufficient to show appellants discovered source of the problem); In re Kaslow, 707 F.2d 1366, 217 USPQ 1089 (Fed. Cir. 1983) (Claims were directed to a method for redeeming merchandising coupons which contain a UPC “5-by-5” bar code wherein, among other steps, the memory at each supermarket would identify coupons by manufacturer and transmit the data to a central computer to provide an audit, thereby eliminating the need for clearinghouses and preventing retailer fraud. In challenging the propriety of an obviousness rejection, appellant argued he discovered the source of a problem (retailer fraud and manual clearinghouse operations) and its solution. The court found appellant’s specification did not support the argument that he discovered the source of the problem with respect to retailer fraud, and that the claimed invention failed to solve the problem of manual clearinghouse operations.).

Jump to MPEP SourceClaims Directed ToPatent Application ContentDifferences Between Claimed Invention and Prior Art
Topic

Claim Subject Matter

1 rules
StatutoryInformativeAlways
[mpep-2141-02-1822e01a14b975e64dec0bcb]
Claims Must Be Supported by Description of Problem Solution
Note:
The specification must clearly describe the invention’s solution to the problem it addresses, particularly for claims involving retailer fraud and manual clearinghouse operations.

Applicants who allege the inventor discovered the source of a problem must provide evidence substantiating the allegation, either by way of affidavits or declarations, or by way of a clear and persuasive assertion in the specification. In re Wiseman, 596 F.2d 1019, 201 USPQ 658 (CCPA 1979) (unsubstantiated statement of counsel was insufficient to show appellants discovered source of the problem); In re Kaslow, 707 F.2d 1366, 217 USPQ 1089 (Fed. Cir. 1983) (Claims were directed to a method for redeeming merchandising coupons which contain a UPC “5-by-5” bar code wherein, among other steps, the memory at each supermarket would identify coupons by manufacturer and transmit the data to a central computer to provide an audit, thereby eliminating the need for clearinghouses and preventing retailer fraud. In challenging the propriety of an obviousness rejection, appellant argued he discovered the source of a problem (retailer fraud and manual clearinghouse operations) and its solution. The court found appellant’s specification did not support the argument that he discovered the source of the problem with respect to retailer fraud, and that the claimed invention failed to solve the problem of manual clearinghouse operations.).

Jump to MPEP SourceClaim Subject MatterDifferences Between Claimed Invention and Prior Art
Topic

Claims

1 rules
StatutoryRequiredAlways
[mpep-2141-02-53cf4b2ccf0e537b34109b05]
Invention as a Whole Must Be Obvious Under 35 U.S.C. 103
Note:
The claimed invention must be obvious in its entirety, not just parts, when determining the obviousness of a composition of matter claim.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Topic

Composition of Matter Claims

1 rules
StatutoryInformativeAlways
[mpep-2141-02-b06f0086daa073c2ff7fc131]
Known Result-Effective Variable Not Necessarily Motivating Factor
Note:
After KSR, a known result-effective variable is one but not the only motivation for a skilled artisan to experiment. The presence of such a variable does not automatically render an invention obvious.

“In determining whether the invention as a whole would have been obvious under 35 U.S.C. 103, we must first delineate the invention as a whole. In delineating the invention as a whole, we look not only to the subject matter which is literally recited in the claim in question… but also to those properties of the subject matter which are inherent in the subject matter and are disclosed in the specification… Just as we look to a chemical and its properties when we examine the obviousness of a composition of matter claim, it is this invention as a whole, and not some part of it, which must be obvious under 35 U.S.C. 103.” In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977) (emphasis in original) (citations omitted) (The claimed wastewater treatment device had a tank volume to contactor area of 0.12 gal./sq. ft. The court found the invention as a whole was the ratio of 0.12 and its inherent property that the claimed devices maximized treatment capacity regardless of other variables in the devices. The prior art did not recognize that treatment capacity was a function of the tank volume to contactor ratio, and therefore the parameter optimized was not recognized in the art to be a result-effective variable.). Note, however, that after KSR, the presence of a known result-effective variable would be one, but not necessarily the only, motivation for a person of ordinary skill in the art to experiment to reach another workable product or process. See MPEP § 2144.05, subsection II.B. See also In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963) (“From the standpoint of patent law, a compound and all its properties are inseparable.”).

Jump to MPEP SourceComposition of Matter ClaimsLevel of Ordinary Skill in the ArtObviousness of Ranges and Values

Citations

Primary topicCitation
AIA vs Pre-AIA Practice
Determining Whether Application Is AIA or Pre-AIA
35 U.S.C. § 102
35 U.S.C. 103 – Obviousness
Claims
Composition of Matter Claims
Differences Between Claimed Invention and Prior Art
Implicit or Inherent Motivation
Obviousness
Scope and Content of Prior Art
35 U.S.C. § 103
37 CFR § 2116.01
MPEP § 2111
Differences Between Claimed Invention and Prior Art
Obviousness
MPEP § 2112
MPEP § 2123
MPEP § 2143.03
35 U.S.C. 103 – Obviousness
Claims
Composition of Matter Claims
Implicit or Inherent Motivation
Scope and Content of Prior Art
MPEP § 2144.05
AIA vs Pre-AIA Practice
Determining Whether Application Is AIA or Pre-AIA
MPEP § 2150
35 U.S.C. 103 – Obviousness
Differences Between Claimed Invention and Prior Art
Scope and Content of Prior Art
Allied Erecting v. Genesis Attachments, 825 F.3d 1373, 1381, 119 USPQ2d 1132, 1138 (Fed. Cir. 2016)
35 U.S.C. 103 – Obviousness
Claims
Composition of Matter Claims
Implicit or Inherent Motivation
Scope and Content of Prior Art
In re Antonie, 559 F.2d 618, 620, 195 USPQ 6, 8 (CCPA 1977)
In re Fulton, 391 F.3d 1195, 1201, 73 USPQ2d 1141, 1146 (Fed. Cir. 2004)
35 U.S.C. 103 – Obviousness
Differences Between Claimed Invention and Prior Art
Level of Ordinary Skill in the Art
Payment Methods
In re Hirao, 535 F.2d 67, 190 USPQ 15 (CCPA 1976)
Claim Subject Matter
Claims Directed To
Obviousness
In re Kaslow, 707 F.2d 1366, 217 USPQ 1089 (Fed. Cir. 1983)
35 U.S.C. 103 – Obviousness
Claims
Composition of Matter Claims
Implicit or Inherent Motivation
Scope and Content of Prior Art
In re Papesch, 315 F.2d 381, 391, 137 USPQ 43, 51 (CCPA 1963)
Differences Between Claimed Invention and Prior Art
Obviousness
In re Rijckaert, 9 F.3d 1531, 28 USPQ2d 1955 (Fed. Cir. 1993)
Obviousness
Scope and Content of Prior Art
In re Sponnoble, 405 F.2d 578, 585, 160 USPQ 237, 243 (CCPA 1969)
Claim Subject Matter
Claims Directed To
Obviousness
Scope and Content of Prior Art
In re Wiseman, 596 F.2d 1019, 201 USPQ 658 (CCPA 1979)
35 U.S.C. 103 – Obviousness
Differences Between Claimed Invention and Prior Art
Scope and Content of Prior Art
Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 698 (Fed. Cir. 1983)
See also Jones v. Hardy, 727 F.2d 1524, 1530, 220 USPQ 1021, 1026 (Fed. Cir. 1984)
35 U.S.C. 103 – Obviousness
Differences Between Claimed Invention and Prior Art
Scope and Content of Prior Art
Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 218 USPQ 871 (Fed. Cir. 1983)

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2026-01-10