MPEP § 2141.01 — Scope and Content of the Prior Art (Annotated Rules)

§2141.01 Scope and Content of the Prior Art

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

This page consolidates and annotates all enforceable requirements under MPEP § 2141.01, 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.

Scope and Content of the Prior Art

This section addresses Scope and Content of the Prior Art. Primary authority: 35 U.S.C. 102, 35 U.S.C. 103, and 35 U.S.C. 102(a)(2). Contains: 2 requirements, 3 prohibitions, 3 permissions, and 12 other statements.

Key Rules

Topic

Determining Whether Application Is AIA or Pre-AIA

10 rules
StatutoryInformativeAlways
[mpep-2141-01-56aea84fb7ef26f609586d14]
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 evidence 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-2141-01-cc112d5acda86d89ccb59098]
Determination of AIA vs Pre-AIA for Prior Art
Note:
This rule requires determining whether an application is subject to AIA or pre-AIA law when assessing the relevance of prior art.

[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
StatutoryProhibitedAlways
[mpep-2141-01-c731dc66a8801821f4d40f7a]
35 U.S.C. 102 Reference Not Usable in Obviousness Rejection
Note:
A 35 U.S.C. 102 reference used for anticipation but overcome by a declaration cannot be used in an obviousness rejection.

An obviousness rejection is ordinarily based on a disclosure that qualifies as prior art under 35 U.S.C. 102 or pre-AIA 35 U.S.C. 102. If it is established that a disclosure does not qualify as prior art under an appropriate section of 35 U.S.C. 102, then the disclosure is also not prior art that can be used in an obviousness rejection. For instance, for a claimed invention subject to 35 U.S.C. 102, a 35 U.S.C. 102(a)(2) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.130(a) cannot be used in an obviousness rejection. Likewise, for a claimed invention subject to pre-AIA 35 U.S.C. 102, a pre-AIA 35 U.S.C. 102(a) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.131 cannot be used in an obviousness rejection.

Jump to MPEP Source · 37 CFR 1.130(a)Determining Whether Application Is AIA or Pre-AIAAntedating Reference – Pre-AIA (MPEP 2136.05)1.130 Affidavit or Declaration (MPEP 2155)
StatutoryProhibitedAlways
[mpep-2141-01-86d935243a5594b27a242678]
Anticipation Ref Can't Be Used for Obviousness
Note:
A reference used in an anticipation rejection that is overcome by a declaration cannot be used in an obviousness rejection.

An obviousness rejection is ordinarily based on a disclosure that qualifies as prior art under 35 U.S.C. 102 or pre-AIA 35 U.S.C. 102. If it is established that a disclosure does not qualify as prior art under an appropriate section of 35 U.S.C. 102, then the disclosure is also not prior art that can be used in an obviousness rejection. For instance, for a claimed invention subject to 35 U.S.C. 102, a 35 U.S.C. 102(a)(2) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.130(a) cannot be used in an obviousness rejection. Likewise, for a claimed invention subject to pre-AIA 35 U.S.C. 102, a pre-AIA 35 U.S.C. 102(a) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.131 cannot be used in an obviousness rejection.

Jump to MPEP Source · 37 CFR 1.130(a)Determining Whether Application Is AIA or Pre-AIAAntedating Reference – Pre-AIA (MPEP 2136.05)Differences Between Claimed Invention and Prior Art
StatutoryInformativeAlways
[mpep-2141-01-42bac593e0fe2e249026e08c]
Requirement for Invention Before Filing Date
Note:
The rule requires that prior art references must be considered before the effective filing date of the claimed invention to avoid hindsight bias.

The purpose of the pre-AIA 35 U.S.C. 103(a) requirement “at the time the invention was made” is to avoid impermissible hindsight. Likewise, the AIA 35 U.S.C. 103 requirement “before the effective filing date of the claimed invention” serves the same purpose. See MPEP § 2145, subsection X.A. for a discussion of rebutting applicants’ arguments that a rejection is based on hindsight.

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADifferences Between Claimed Invention and Prior ArtDetermining AIA vs Pre-AIA Applicability (MPEP 2159)
StatutoryInformativeAlways
[mpep-2141-01-4baff2de7831bbf130e32817]
Requirement for Considering Prior Art from Inventor’s Perspective
Note:
The decisionmaker must disregard their knowledge of the claimed invention and evaluate it as if they were a person skilled in the art at the time the invention was made.

In the pre-AIA context, the Federal Circuit stated, “[i]t is difficult but necessary that the decisionmaker forget what he or she has been taught… about the claimed invention and cast the mind back to the time the invention was made (often as here many years), to occupy the mind of one skilled in the art….” W.L. Gore & Associates, Inc. v. Garlock, Inc., 721 F.2d 1540, 1553, 220 USPQ 303, 313 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984). Although the AIA has changed the relevant time focus to “before the effective filing date of the claimed invention,” the observation expressed by the Federal Circuit otherwise continues to apply.

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)AIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2141-01-215c969bc469c15ffd881a78]
Determining Pre-AIA vs AIA Status for Prior Art Analysis
Note:
The rule explains how to determine whether the pre-AIA or AIA standards should be applied when analyzing prior art, emphasizing the importance of considering the effective filing date.

In the pre-AIA context, the Federal Circuit stated, “[i]t is difficult but necessary that the decisionmaker forget what he or she has been taught… about the claimed invention and cast the mind back to the time the invention was made (often as here many years), to occupy the mind of one skilled in the art….” W.L. Gore & Associates, Inc. v. Garlock, Inc., 721 F.2d 1540, 1553, 220 USPQ 303, 313 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984). Although the AIA has changed the relevant time focus to “before the effective filing date of the claimed invention,” the observation expressed by the Federal Circuit otherwise continues to apply.

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)AIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2141-01-850479e165a855e86a4d3fc7]
Pre-AIA Prior Art Focus Continues After AIA Transition
Note:
The Federal Circuit’s observation about considering the mind of one skilled in the art at the time of invention continues to apply even after the transition to the AIA system, focusing on the effective filing date.

In the pre-AIA context, the Federal Circuit stated, “[i]t is difficult but necessary that the decisionmaker forget what he or she has been taught… about the claimed invention and cast the mind back to the time the invention was made (often as here many years), to occupy the mind of one skilled in the art….” W.L. Gore & Associates, Inc. v. Garlock, Inc., 721 F.2d 1540, 1553, 220 USPQ 303, 313 (Fed. Cir. 1983), cert. denied, 469 U.S. 851 (1984). Although the AIA has changed the relevant time focus to “before the effective filing date of the claimed invention,” the observation expressed by the Federal Circuit otherwise continues to apply.

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)AIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2141-01-d9f6ffe62c88a5e13a7cd792]
Requirement for Establishing Same Ownership for Prior Art and Invention
Note:
An applicant must prove that the prior art used in an obviousness rejection and the claimed invention were owned by the same person or subject to an assignment obligation at the time of invention.
An applicant subject to pre-AIA 35 U.S.C. 102 who wants to rely on pre-AIA 35 U.S.C. 103(c) to overcome an obviousness rejection has the burden of establishing that subject matter which only qualifies as prior art under subsection (e), (f) or (g) of pre-AIA 35 U.S.C. 102 used in a rejection under pre-AIA 35 U.S.C. 103(a) and the claimed invention were, at the time the invention was made, owned by the same person or subject to an obligation of assignment to the same person. Likewise, an applicant who wants to rely on the joint research provisions of pre-AIA 35 U.S.C. 103(c) (for applications pending on or after December 10, 2004) has the burden of establishing that:
  • (A) the claimed invention was made by or on behalf of parties to a joint research agreement that was in effect on or before the date the claimed invention was made;
  • (B) the claimed invention was made as a result of activities undertaken within the scope of the joint research agreement; and
  • (C) the application for patent for the claimed invention discloses or is amended to disclose the names of the parties to the joint research agreement.
Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADifferences Between Claimed Invention and Prior ArtScope and Content of Prior Art
StatutoryInformativeAlways
[mpep-2141-01-54257238122e5400b64ca3c0]
Disclosure of Joint Research Agreement Parties Required
Note:
An applicant must disclose the names of the parties to the joint research agreement in the application for patent to rely on pre-AIA 35 U.S.C. 103(c) provisions.

An applicant subject to pre-AIA 35 U.S.C. 102 who wants to rely on pre-AIA 35 U.S.C. 103(c) to overcome an obviousness rejection has the burden of establishing that subject matter which only qualifies as prior art under subsection (e), (f) or (g) of pre-AIA 35 U.S.C. 102 used in a rejection under pre-AIA 35 U.S.C. 103(a) and the claimed invention were, at the time the invention was made, owned by the same person or subject to an obligation of assignment to the same person. Likewise, an applicant who wants to rely on the joint research provisions of pre-AIA 35 U.S.C. 103(c) (for applications pending on or after December 10, 2004) has the burden of establishing that:

(C) the application for patent for the claimed invention discloses or is amended to disclose the names of the parties to the joint research agreement.

Jump to MPEP SourceDetermining Whether Application Is AIA or Pre-AIADifferences Between Claimed Invention and Prior ArtDetermining AIA vs Pre-AIA Applicability (MPEP 2159)
Topic

Scope and Content of Prior Art

9 rules
StatutoryRequiredAlways
[mpep-2141-01-a18bfa0c89f82e5d7be1b4d9]
Determine Prior Art Before Graham Content Inquiry
Note:
Before assessing the content of a patent or publication, it must first be determined whether it qualifies as prior art under 35 U.S.C. § 102.

“Before answering Graham’s ‘content’ inquiry, it must be known whether a patent or publication is in the prior art under 35 U.S.C. § 102.” Panduit Corp. v. Dennison Mfg. Co., 810 F.2d 1561, 1568, 1 USPQ2d 1593, 1597 (Fed. Cir.), cert. denied, 481 U.S. 1052 (1987). Subject matter that is prior art under 35 U.S.C. 102 can be used to support a rejection under section 103. Ex parte Andresen, 212 USPQ 100, 102 (Bd. Pat. App. & Inter. 1981) (“it appears to us that the commentator [of 35 U.S.C.A.] and the [congressional] committee viewed section 103 as including all of the various bars to a patent as set forth in section 102.”). See also In re Wertheim, 646 F.2d 527, 532, 209 USPQ 554, 560 (CCPA 1981) (“Commensurate with the Senate Report and Mr. Federico's commentary, we have held that the term ‘prior art’ refers ‘to at least the statutory prior art material named in § 102.’”); and In re Hoeksema, 399 F.2d 269, 273, 158 USPQ 596, 600 (CCPA 1968) (“[w]hile 35 U.S.C. 102 is not directly involved in the issue on review, the conditions for patentability, novelty and loss of right to patent, there stated, may have relevance as to the disclosure which must be found in the prior art to find obviousness of an invention under section 103.”).

Jump to MPEP SourceScope and Content of Prior ArtGraham v. Deere FactorsObviousness
StatutoryInformativeAlways
[mpep-2141-01-3fdaeb2ed7c4b256997155e2]
Subject Matter Prior to 102 Can Support 103 Rejection
Note:
The scope of prior art under section 102 can be used to support a rejection under section 103.

“Before answering Graham’s ‘content’ inquiry, it must be known whether a patent or publication is in the prior art under 35 U.S.C. § 102.” Panduit Corp. v. Dennison Mfg. Co., 810 F.2d 1561, 1568, 1 USPQ2d 1593, 1597 (Fed. Cir.), cert. denied, 481 U.S. 1052 (1987). Subject matter that is prior art under 35 U.S.C. 102 can be used to support a rejection under section 103. Ex parte Andresen, 212 USPQ 100, 102 (Bd. Pat. App. & Inter. 1981) (“it appears to us that the commentator [of 35 U.S.C.A.] and the [congressional] committee viewed section 103 as including all of the various bars to a patent as set forth in section 102.”). See also In re Wertheim, 646 F.2d 527, 532, 209 USPQ 554, 560 (CCPA 1981) (“Commensurate with the Senate Report and Mr. Federico's commentary, we have held that the term ‘prior art’ refers ‘to at least the statutory prior art material named in § 102.’”); and In re Hoeksema, 399 F.2d 269, 273, 158 USPQ 596, 600 (CCPA 1968) (“[w]hile 35 U.S.C. 102 is not directly involved in the issue on review, the conditions for patentability, novelty and loss of right to patent, there stated, may have relevance as to the disclosure which must be found in the prior art to find obviousness of an invention under section 103.”).

Jump to MPEP SourceScope and Content of Prior ArtGraham v. Deere FactorsObviousness
StatutoryRequiredAlways
[mpep-2141-01-b260132308a71106c1b12308]
Prior Art Can Support Section 103 Rejection
Note:
Subject matter that is prior art under section 102 can be used to support a rejection under section 103.

“Before answering Graham’s ‘content’ inquiry, it must be known whether a patent or publication is in the prior art under 35 U.S.C. § 102.” Panduit Corp. v. Dennison Mfg. Co., 810 F.2d 1561, 1568, 1 USPQ2d 1593, 1597 (Fed. Cir.), cert. denied, 481 U.S. 1052 (1987). Subject matter that is prior art under 35 U.S.C. 102 can be used to support a rejection under section 103. Ex parte Andresen, 212 USPQ 100, 102 (Bd. Pat. App. & Inter. 1981) (“it appears to us that the commentator [of 35 U.S.C.A.] and the [congressional] committee viewed section 103 as including all of the various bars to a patent as set forth in section 102.”). See also In re Wertheim, 646 F.2d 527, 532, 209 USPQ 554, 560 (CCPA 1981) (“Commensurate with the Senate Report and Mr. Federico's commentary, we have held that the term ‘prior art’ refers ‘to at least the statutory prior art material named in § 102.’”); and In re Hoeksema, 399 F.2d 269, 273, 158 USPQ 596, 600 (CCPA 1968) (“[w]hile 35 U.S.C. 102 is not directly involved in the issue on review, the conditions for patentability, novelty and loss of right to patent, there stated, may have relevance as to the disclosure which must be found in the prior art to find obviousness of an invention under section 103.”).

Jump to MPEP SourceScope and Content of Prior ArtObviousness
StatutoryPermittedAlways
[mpep-2141-01-09c76a48de2754175c82d8cd]
Admitted Prior Art Used for Anticipation and Obviousness
Note:
Admitted prior art can be used to determine both anticipation and obviousness, regardless of its qualification under 35 U.S.C. 102.

Furthermore, admitted prior art can be relied upon for both anticipation and obviousness determinations, regardless of whether the admitted prior art would otherwise qualify as prior art under the statutory categories of 35 U.S.C. 102. Riverwood Int’l Corp. v. R.A. Jones & Co., 324 F.3d 1346, 1354, 66 USPQ2d 1331, 1337 (Fed. Cir. 2003); Constant v. Advanced Micro-Devices Inc., 848 F.2d 1560, 1570, 7 USPQ2d 1057, 1063 (Fed. Cir. 1988). See MPEP § 2129 for discussion of admissions as prior art.

Jump to MPEP SourceScope and Content of Prior ArtAnticipation/NoveltyObviousness
StatutoryInformativeAlways
[mpep-2141-01-a746c0066c7b619b23f7ae7d]
Admitted Prior Art Used for Anticipation and Obviousness
Note:
Admitted prior art can be used to determine both anticipation and obviousness, regardless of its typical qualification as prior art.

Furthermore, admitted prior art can be relied upon for both anticipation and obviousness determinations, regardless of whether the admitted prior art would otherwise qualify as prior art under the statutory categories of 35 U.S.C. 102. Riverwood Int’l Corp. v. R.A. Jones & Co., 324 F.3d 1346, 1354, 66 USPQ2d 1331, 1337 (Fed. Cir. 2003); Constant v. Advanced Micro-Devices Inc., 848 F.2d 1560, 1570, 7 USPQ2d 1057, 1063 (Fed. Cir. 1988). See MPEP § 2129 for discussion of admissions as prior art.

Jump to MPEP SourceScope and Content of Prior ArtGraham v. Deere FactorsAnticipation/Novelty
StatutoryPermittedAlways
[mpep-2141-01-307e72191fea1607dfb61799]
Disclosure Not Prior Art Cannot Be Used In Obviousness Rejection
Note:
A disclosure that does not qualify as prior art under 35 U.S.C. 102 cannot be used in an obviousness rejection.

An obviousness rejection is ordinarily based on a disclosure that qualifies as prior art under 35 U.S.C. 102 or pre-AIA 35 U.S.C. 102. If it is established that a disclosure does not qualify as prior art under an appropriate section of 35 U.S.C. 102, then the disclosure is also not prior art that can be used in an obviousness rejection. For instance, for a claimed invention subject to 35 U.S.C. 102, a 35 U.S.C. 102(a)(2) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.130(a) cannot be used in an obviousness rejection. Likewise, for a claimed invention subject to pre-AIA 35 U.S.C. 102, a pre-AIA 35 U.S.C. 102(a) reference used in an anticipation rejection but overcome by submitting a declaration under 37 CFR 1.131 cannot be used in an obviousness rejection.

Jump to MPEP Source · 37 CFR 1.130(a)Scope and Content of Prior ArtPrior Art Under Pre-AIA 35 U.S.C. 102 (MPEP 2131-2138)Grace Period Exception – 102(b) (MPEP 2153)
StatutoryInformativeAlways
[mpep-2141-01-347ae3c8006b5dcf46a55a70]
Prior Art Disqualifications Under Pre-AIA 35 U.S.C. 103(c)
Note:
This rule specifies that prior art disqualifications under pre-AIA 35 U.S.C. 103(c) are only applicable for subject matter qualifying as prior art under subsections (e), (f), or (g) of pre-AIA 35 U.S.C. 102 and used in a rejection under pre-AIA 35 U.S.C. 103(a).

These prior art disqualifications under pre-AIA 35 U.S.C 103(c) are only applicable for subject matter which only qualifies as prior art under subsection (e), (f) or (g) of pre-AIA 35 U.S.C. 102 and is used in a rejection under pre-AIA 35 U.S.C. 103(a).

Jump to MPEP SourceScope and Content of Prior ArtObviousness Under AIA (MPEP 2158)Obviousness Under Pre-AIA (MPEP 2141-2146)
StatutoryInformativeAlways
[mpep-2141-01-d336e5d815d67f1c958d9aab]
Pre-AIA 35 U.S.C. 103(c) Limited to Specific Prior Art
Note:
The rule states that for applications filed before November 29, 1999, and granted as patents prior to December 10, 2004, pre-AIA 35 U.S.C. 103(c) is limited to subject matter developed by another person which qualifies as prior art only under subsections (f) or (g) of pre-AIA 35 U.S.C. 102.

Note that for applications filed prior to November 29, 1999, and granted as patents prior to December 10, 2004, pre-AIA 35 U.S.C. 103(c) is limited on its face to subject matter developed by another person which qualifies as prior art only under subsection (f) or (g) of pre-AIA 35 U.S.C. 102. See MPEP § 2146.01. See also In re Bartfeld, 925 F.2d 1450, 1453-54, 17 USPQ2d 1885, 1888 (Fed. Cir. 1991) (Applicant attempted to overcome a pre-AIA 35 U.S.C. 102(e) / 103 rejection with a terminal disclaimer by alleging that the public policy intent of pre-AIA 35 U.S.C 103(c) was to prohibit the use of “secret” prior art in obviousness determinations. The court rejected this argument, holding “We may not disregard the unambiguous exclusion of § 102(e) from the statute’s purview.”).

Jump to MPEP SourceScope and Content of Prior ArtAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryProhibitedAlways
[mpep-2141-01-9e393daae79c52581c3e7bf1]
102(e) Not Covered by 103(c)
Note:
The court held that pre-AIA 35 U.S.C. 103(c) does not cover subject matter developed by another person under 102(e).

Note that for applications filed prior to November 29, 1999, and granted as patents prior to December 10, 2004, pre-AIA 35 U.S.C. 103(c) is limited on its face to subject matter developed by another person which qualifies as prior art only under subsection (f) or (g) of pre-AIA 35 U.S.C. 102. See MPEP § 2146.01. See also In re Bartfeld, 925 F.2d 1450, 1453-54, 17 USPQ2d 1885, 1888 (Fed. Cir. 1991) (Applicant attempted to overcome a pre-AIA 35 U.S.C. 102(e) / 103 rejection with a terminal disclaimer by alleging that the public policy intent of pre-AIA 35 U.S.C 103(c) was to prohibit the use of “secret” prior art in obviousness determinations. The court rejected this argument, holding “We may not disregard the unambiguous exclusion of § 102(e) from the statute’s purview.”).

Jump to MPEP SourceScope and Content of Prior ArtGraham v. Deere FactorsAssignee as Applicant Signature
Topic

AIA vs Pre-AIA Practice

3 rules
StatutoryInformativeAlways
[mpep-2141-01-93d325c2dac91d03c395b124]
AIA and Pre-AIA Practice for Applications
Note:
This rule outlines the practice for applications subject to both AIA and pre-AIA laws, specifying the relevant time periods for determining prior art.

[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-2141-01-037bde65fe3eafc2f422b8c6]
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-2141-01-9e964e0a03f8341428671ec2]
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

35 U.S.C. 102 – Novelty / Prior Art

1 rules
StatutoryInformativeAlways
[mpep-2141-01-b0d889fa6e5804d35bea81fd]
Overview of Prior Art Under 35 U.S.C. 102
Note:
Provides an overview of what constitutes prior art under the provisions of 35 U.S.C. 102.

For an overview of what constitutes prior art under 35 U.S.C. 102, see MPEP § 901§ 901.06(d), § 2121§ 2129 and § 2151§ 2155.

Jump to MPEP Source · 37 CFR 901.06(d)Novelty / Prior Art
Topic

Obviousness Under AIA (MPEP 2158)

1 rules
StatutoryInformativeAlways
[mpep-2141-01-370fa24a7692052391519dcc]
Requirement for Avoiding Hindsight in Obviousness Determination
Note:
The pre-AIA 35 U.S.C. 103(a) requirement at the time the invention was made aims to prevent using knowledge after the fact when determining obviousness.

The purpose of the pre-AIA 35 U.S.C. 103(a) requirement “at the time the invention was made” is to avoid impermissible hindsight. Likewise, the AIA 35 U.S.C. 103 requirement “before the effective filing date of the claimed invention” serves the same purpose. See MPEP § 2145, subsection X.A. for a discussion of rebutting applicants’ arguments that a rejection is based on hindsight.

Jump to MPEP SourceObviousness Under AIA (MPEP 2158)Obviousness Under Pre-AIA (MPEP 2141-2146)AIA vs Pre-AIA Practice

Citations

Primary topicCitation
35 U.S.C. 102 – Novelty / Prior Art
AIA vs Pre-AIA Practice
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
35 U.S.C. § 102
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
35 U.S.C. § 102(a)
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
35 U.S.C. § 102(a)(2)
Scope and Content of Prior Art35 U.S.C. § 102(e)
Determining Whether Application Is AIA or Pre-AIA
Obviousness Under AIA (MPEP 2158)
35 U.S.C. § 103
Determining Whether Application Is AIA or Pre-AIA
Obviousness Under AIA (MPEP 2158)
Scope and Content of Prior Art
35 U.S.C. § 103(a)
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
35 U.S.C. § 103(c)
35 U.S.C. 102 – Novelty / Prior Art35 U.S.C. § 2121
35 U.S.C. 102 – Novelty / Prior Art35 U.S.C. § 2129
35 U.S.C. 102 – Novelty / Prior Art35 U.S.C. § 2151
35 U.S.C. 102 – Novelty / Prior Art35 U.S.C. § 2155
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
37 CFR § 1.130(a)
Determining Whether Application Is AIA or Pre-AIA
Scope and Content of Prior Art
37 CFR § 1.131
35 U.S.C. 102 – Novelty / Prior Art37 CFR § 901.06(d)
MPEP § 2121
Scope and Content of Prior ArtMPEP § 2129
Determining Whether Application Is AIA or Pre-AIA
Obviousness Under AIA (MPEP 2158)
MPEP § 2145
Scope and Content of Prior ArtMPEP § 2146.01
MPEP § 2146.02
AIA vs Pre-AIA Practice
Determining Whether Application Is AIA or Pre-AIA
MPEP § 2150
35 U.S.C. 102 – Novelty / Prior ArtMPEP § 901
Determining Whether Application Is AIA or Pre-AIAAssociates, Inc. v. Garlock, Inc., 721 F.2d 1540, 1553, 220 USPQ 303, 313 (Fed. Cir. 1983)
Scope and Content of Prior ArtConstant v. Advanced Micro-Devices Inc., 848 F.2d 1560, 1570, 7 USPQ2d 1057, 1063 (Fed. Cir. 1988)
Scope and Content of Prior ArtIn re Hoeksema, 399 F.2d 269, 273, 158 USPQ 596, 600 (CCPA 1968)
Scope and Content of Prior ArtIn re Wertheim, 646 F.2d 527, 532, 209 USPQ 554, 560 (CCPA 1981)

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