MPEP § 2106.05(g) — Insignificant Extra-Solution Activity (Annotated Rules)

§2106.05(g) Insignificant Extra-Solution Activity

USPTO MPEP version: BlueIron's Update: 2026-01-17

This page consolidates and annotates all enforceable requirements under MPEP § 2106.05(g), 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.

Insignificant Extra-Solution Activity

This section addresses Insignificant Extra-Solution Activity. Contains: 1 guidance statement, 1 permission, and 7 other statements.

Key Rules

Topic

35 U.S.C. 103 – Obviousness

4 rules
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-0a8d1c65065f1f9675819ccd]
Requirement for Insignificant Extra-Solution Activity Not Amounting to Inventive Concept
Note:
The addition of well-understood or conventional extra-solution activity does not constitute an inventive concept.

As explained by the Supreme Court, the addition of insignificant extra-solution activity does not amount to an inventive concept, particularly when the activity is well-understood or conventional. Parker v. Flook, 437 U.S. 584, 588-89, 198 USPQ 193, 196 (1978). In Flook, the Court reasoned that “[t]he notion that post-solution activity, no matter how conventional or obvious in itself, can transform an unpatentable principle into a patentable process exalts form over substance. A competent draftsman could attach some form of post-solution activity to almost any mathematical formula”. 437 U.S. at 590; 198 USPQ at 197; Id. (holding that step of adjusting an alarm limit variable to a figure computed according to a mathematical formula was “post-solution activity”). See also Mayo Collaborative Servs. v. Prometheus Labs. Inc., 566 U.S. 66, 79, 101 USPQ2d 1961, 1968 (2012) (additional element of measuring metabolites of a drug administered to a patient was insignificant extra-solution activity).

MPEP GuidancePermittedAlways
[mpep-2106-05-g-e587f9b6c92a26ebacced6d1]
Post-Solution Activity Does Not Transform Unpatentable Principle
Note:
The addition of conventional post-solution activity does not render an unpatentable principle patentable, as it merely exalts form over substance.

As explained by the Supreme Court, the addition of insignificant extra-solution activity does not amount to an inventive concept, particularly when the activity is well-understood or conventional. Parker v. Flook, 437 U.S. 584, 588-89, 198 USPQ 193, 196 (1978). In Flook, the Court reasoned that “[t]he notion that post-solution activity, no matter how conventional or obvious in itself, can transform an unpatentable principle into a patentable process exalts form over substance. A competent draftsman could attach some form of post-solution activity to almost any mathematical formula”. 437 U.S. at 590; 198 USPQ at 197; Id. (holding that step of adjusting an alarm limit variable to a figure computed according to a mathematical formula was “post-solution activity”). See also Mayo Collaborative Servs. v. Prometheus Labs. Inc., 566 U.S. 66, 79, 101 USPQ2d 1961, 1968 (2012) (additional element of measuring metabolites of a drug administered to a patient was insignificant extra-solution activity).

MPEP GuidanceInformativeAlways
[mpep-2106-05-g-d743b79017c9c35eb00798c2]
Insignificant Post-Solution Activity Is Not Inventive Concept
Note:
A competent draftsman can attach insignificant post-solution activity to any mathematical formula, which does not constitute an inventive concept.

As explained by the Supreme Court, the addition of insignificant extra-solution activity does not amount to an inventive concept, particularly when the activity is well-understood or conventional. Parker v. Flook, 437 U.S. 584, 588-89, 198 USPQ 193, 196 (1978). In Flook, the Court reasoned that “[t]he notion that post-solution activity, no matter how conventional or obvious in itself, can transform an unpatentable principle into a patentable process exalts form over substance. A competent draftsman could attach some form of post-solution activity to almost any mathematical formula”. 437 U.S. at 590; 198 USPQ at 197; Id. (holding that step of adjusting an alarm limit variable to a figure computed according to a mathematical formula was “post-solution activity”). See also Mayo Collaborative Servs. v. Prometheus Labs. Inc., 566 U.S. 66, 79, 101 USPQ2d 1961, 1968 (2012) (additional element of measuring metabolites of a drug administered to a patient was insignificant extra-solution activity).

MPEP GuidanceInformativeAlways
[mpep-2106-05-g-a1386ce77b18097630c3a590]
Insignificant Extra-Solution Activity Does Not Constitute Invention
Note:
The rule states that adding insignificant extra-solution activity, such as well-understood or conventional steps, does not constitute an inventive concept and cannot transform an unpatentable principle into a patentable process.

As explained by the Supreme Court, the addition of insignificant extra-solution activity does not amount to an inventive concept, particularly when the activity is well-understood or conventional. Parker v. Flook, 437 U.S. 584, 588-89, 198 USPQ 193, 196 (1978). In Flook, the Court reasoned that “[t]he notion that post-solution activity, no matter how conventional or obvious in itself, can transform an unpatentable principle into a patentable process exalts form over substance. A competent draftsman could attach some form of post-solution activity to almost any mathematical formula”. 437 U.S. at 590; 198 USPQ at 197; Id. (holding that step of adjusting an alarm limit variable to a figure computed according to a mathematical formula was “post-solution activity”). See also Mayo Collaborative Servs. v. Prometheus Labs. Inc., 566 U.S. 66, 79, 101 USPQ2d 1961, 1968 (2012) (additional element of measuring metabolites of a drug administered to a patient was insignificant extra-solution activity).

Topic

Third Party Access to Files (MPEP 103, 1134.01)

3 rules
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-1ea9ead814a390415d2dee5b]
Limitation Must Be Meaningful for Invention
Note:
A claim limitation must impose meaningful restrictions on the invention to be significant, not just tangential or nominal.

(2) Whether the limitation is significant (i.e. it imposes meaningful limits on the claim such that it is not nominally or tangentially related to the invention). See Ultramercial, Inc. v. Hulu, LLC, 772 F.3d 709, 715-16, 112 USPQ2d 1750, 1755 (Fed. Cir. 2014) (restricting public access to media was found to be insignificant extra-solution activity); Apple, Inc. v. Ameranth, Inc., 842 F.3d 1229, 1242, 120 USPQ2d 1844, 1855 (Fed. Cir. 2016) (in patents regarding electronic menus, features related to types of ordering were found to be insignificant extra-solution activity). This is considered in Step 2A Prong Two and Step 2B.

Jump to MPEP SourceThird Party Access to Files (MPEP 103, 1134.01)Access to Patent Application Files (MPEP 101-106)
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-1a6b18e44b2143cc92943666]
Limitation Must Impose Meaningful Limits on Claim
Note:
The limitation must impose meaningful limits on the claim and not be nominally or tangentially related to the invention, as determined in Step 2A Prong Two and Step 2B.

(2) Whether the limitation is significant (i.e. it imposes meaningful limits on the claim such that it is not nominally or tangentially related to the invention). See Ultramercial, Inc. v. Hulu, LLC, 772 F.3d 709, 715-16, 112 USPQ2d 1750, 1755 (Fed. Cir. 2014) (restricting public access to media was found to be insignificant extra-solution activity); Apple, Inc. v. Ameranth, Inc., 842 F.3d 1229, 1242, 120 USPQ2d 1844, 1855 (Fed. Cir. 2016) (in patents regarding electronic menus, features related to types of ordering were found to be insignificant extra-solution activity). This is considered in Step 2A Prong Two and Step 2B.

Jump to MPEP SourceThird Party Access to Files (MPEP 103, 1134.01)Access to Patent Application Files (MPEP 101-106)
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-9226e060095ba8740fc81c36]
Activities Considered Insignificant in Patent Claims
Note:
The courts have found certain activities, such as data gathering and selecting data sources, to be insignificant extra-solution activity in patent claims.
Below are examples of activities that the courts have found to be insignificant extra-solution activity:
  • • Mere Data Gathering:
    • i. Performing clinical tests on individuals to obtain input for an equation, In re Grams, 888 F.2d 835, 839-40; 12 USPQ2d 1824, 1827-28 (Fed. Cir. 1989);
    • ii. Testing a system for a response, the response being used to determine system malfunction, In re Meyers, 688 F.2d 789, 794; 215 USPQ 193, 196-97 (CCPA 1982);
    • iii. Presenting offers to potential customers and gathering statistics generated based on the testing about how potential customers responded to the offers; the statistics are then used to calculate an optimized price, OIP Technologies, 788 F.3d at 1363, 115 USPQ2d at 1092-93;
    • iv. Obtaining information about transactions using the Internet to verify credit card transactions, CyberSource v. Retail Decisions, Inc., 654 F.3d 1366, 1375, 99 USPQ2d 1690, 1694 (Fed. Cir. 2011);
    • v. Consulting and updating an activity log, Ultramercial, 772 F.3d at 715, 112 USPQ2d at 1754; and
    • vi. Determining the level of a biomarker in blood, Mayo, 566 U.S. at 79, 101 USPQ2d at 1968. See also PerkinElmer, Inc. v. Intema Ltd., 496 Fed. App'x 65, 73, 105 USPQ2d 1960, 1966 (Fed. Cir. 2012) (assessing or measuring data derived from an ultrasound scan, to be used in a diagnosis).
  • • Selecting a particular data source or type of data to be manipulated:
    • i. Limiting a database index to XML tags, Intellectual Ventures I LLC v. Erie Indem. Co., 850 F.3d at 1328-29, 121 USPQ2d at 1937;
    • ii. Taking food orders from only table-based customers or drive-through customers, Ameranth, 842 F.3d at 1241-43, 120 USPQ2d at 1854-55;
    • iii. Selecting information, based on types of information and availability of information in a power-grid environment, for collection, analysis and display, Electric Power Group, LLC v. Alstom S.A., 830 F.3d 1350, 1354-55, 119 USPQ2d 1739, 1742 (Fed. Cir. 2016); and
    • iv. Requiring a request from a user to view an advertisement and restricting public access, Ultramercial, 772 F.3d at 715-16, 112 USPQ2d at 1754.
  • • Insignificant application:
    • i. Cutting hair after first determining the hair style, In re Brown, 645 Fed. App'x 1014, 1016-1017 (Fed. Cir. 2016) (non-precedential); and
    • ii. Printing or downloading generated menus, Ameranth, 842 F.3d at 1241-42, 120 USPQ2d at 1854-55.
Jump to MPEP SourceThird Party Access to Files (MPEP 103, 1134.01)Access to Patent Application Files (MPEP 101-106)Derivation Proceedings (AIA)
Topic

Derivation Proceedings (AIA)

1 rules
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-e81955dee49175e721123b7d]
Determining Biomarker Levels Is Insignificant Extra-Solution Activity
Note:
The courts have found that determining biomarker levels in blood is considered insignificant extra-solution activity and does not add patentable weight to a method claim.

Below are examples of activities that the courts have found to be insignificant extra-solution activity:
• Mere Data Gathering vi. Determining the level of a biomarker in blood, Mayo, 566 U.S. at 79, 101 USPQ2d at 1968. See also PerkinElmer, Inc. v. Intema Ltd., 496 Fed. App'x 65, 73, 105 USPQ2d 1960, 1966 (Fed. Cir. 2012) (assessing or measuring data derived from an ultrasound scan, to be used in a diagnosis).

Jump to MPEP SourceDerivation Proceedings (AIA)
Topic

Abstract Ideas

1 rules
MPEP GuidanceRecommendedAlways
[mpep-2106-05-g-f2442522c6f4e029db813a65]
Explain Why Mere Data Gathering Does Not Limit Claim
Note:
Examiners must explain in an eligibility rejection why adding data gathering does not meaningfully limit a claim involving a judicial exception.

For claim limitations that add insignificant extra-solution activity to the judicial exception (e.g., mere data gathering in conjunction with a law of nature or abstract idea), examiners should explain in an eligibility rejection why they do not meaningfully limit the claim. For example, an examiner could explain that adding a final step of storing data to a process that only recites computing the area of a space (a mathematical relationship) does not add a meaningful limitation to the process of computing the area. For more information on formulating a subject matter eligibility rejection, see MPEP § 2106.07(a).

Jump to MPEP SourceAbstract IdeasLaws of NatureResponding to 101 Rejections
Topic

Mathematical Concepts

1 rules
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-e2f3516225973589f9b8dd1b]
Requirement for Non-Meaningful Limitations
Note:
Examiners should explain why adding non-meaningful steps like data storage to a mathematical process does not limit the claim.

For claim limitations that add insignificant extra-solution activity to the judicial exception (e.g., mere data gathering in conjunction with a law of nature or abstract idea), examiners should explain in an eligibility rejection why they do not meaningfully limit the claim. For example, an examiner could explain that adding a final step of storing data to a process that only recites computing the area of a space (a mathematical relationship) does not add a meaningful limitation to the process of computing the area. For more information on formulating a subject matter eligibility rejection, see MPEP § 2106.07(a).

Jump to MPEP SourceMathematical ConceptsProcess (Method)Statutory Categories of Invention
Topic

Responding to 101 Rejections

1 rules
MPEP GuidanceInformativeAlways
[mpep-2106-05-g-e466c9b2d364578d9fe07b08]
Requirement for Meaningful Limitations in Eligibility Rejections
Note:
Examiners must explain why extra steps do not meaningfully limit claims involving abstract ideas or natural laws.

For claim limitations that add insignificant extra-solution activity to the judicial exception (e.g., mere data gathering in conjunction with a law of nature or abstract idea), examiners should explain in an eligibility rejection why they do not meaningfully limit the claim. For example, an examiner could explain that adding a final step of storing data to a process that only recites computing the area of a space (a mathematical relationship) does not add a meaningful limitation to the process of computing the area. For more information on formulating a subject matter eligibility rejection, see MPEP § 2106.07(a).

Jump to MPEP SourceResponding to 101 RejectionsPatent Eligibility

Citations

Primary topicCitation
MPEP § 2106.05(b)
MPEP § 2106.05(d)
MPEP § 2106.05(f)
MPEP § 2106.05(h)
Abstract Ideas
Mathematical Concepts
Responding to 101 Rejections
MPEP § 2106.07(a)
Third Party Access to Files (MPEP 103, 1134.01)Apple, Inc. v. Ameranth, Inc., 842 F.3d 1229, 1242, 120 USPQ2d 1844, 1855 (Fed. Cir. 2016)
Third Party Access to Files (MPEP 103, 1134.01)CyberSource v. Retail Decisions, Inc., 654 F.3d 1366, 1375, 99 USPQ2d 1690, 1694 (Fed. Cir. 2011)

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: 2026-01-17