MPEP § 2304.02(c) — Explaining Priority (Annotated Rules)

§2304.02(c) Explaining Priority

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 2304.02(c), 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.

Explaining Priority

This section addresses Explaining Priority. Primary authority: 35 U.S.C. 119, 35 U.S.C. 365, and 35 U.S.C. 102(a). Contains: 4 requirements, 1 guidance statement, 1 permission, and 9 other statements.

Key Rules

Topic

Obviousness

7 rules
StatutoryInformativeAlways
[mpep-2304-02-c-27e56b2de266ecef752619a9]
Subject Matter Not Determined by Obviousness
Note:
The obviousness test is not used to determine if the subject matter is the same or substantially the same; instead, it focuses on material limitations present in claims.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term Expiration
StatutoryInformativeAlways
[mpep-2304-02-c-eef622cb98eb5db998eeb8d1]
Determination of Substantially Same Subject Matter
Note:
The determination is based on the presence or absence of different material limitations in claims, not on obviousness tests.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-e17e7327f10335d9c16ce12b]
Obviousness Test Is Distinct From Substantially Same Subject Matter Test
Note:
The obviousness test differs from determining if subject matter is substantially the same, focusing on material limitations in claims.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-771dd21f0b12c975aba8728f]
Analysis of Interfering Claims Must Include All Material Limitations
Note:
The analysis must determine if all material limitations in an interfering claim are present in a prior claim.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-80dddc05762cd200613703b7]
Interfering Claim Must Not Have Same Subject Matter
Note:
An interfering claim should not be rejected if none of the prior claims in the application meet the 'substantially the same subject matter' test.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
StatutoryRecommendedAlways
[mpep-2304-02-c-56a4ebe1d98b636272350736]
Interfering Claim Must Meet Substantially Same Test
Note:
An interfering claim should be rejected if none of the claims in the application or parent application prior to one-year expiration meet the 'substantially the same subject matter' test.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-c1285689d1648661a948f7cd]
Interfering Claim Must Not Be Substantially the Same
Note:
An interfering claim must not include all material limitations of a prior claim to avoid being considered substantially the same.

The obviousness test is not the standard for determining whether the subject matter is the same or substantially the same. Rather the determination turns on the presence or absence of a different material limitation in the claim. These tests are distinctly different. The analysis focuses on the interfering claim to determine whether all material limitations of the interfering claim necessarily occur in a prior claim. See In re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002). If none of the claims which were present in the application, or in a parent application, prior to expiration of the one-year period meets the “substantially the same subject matter” test, the interfering claim should be rejected under pre-AIA 35 U.S.C. 135(b). See In re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997).

Jump to MPEP SourceObviousnessPatent Term ExpirationAIA vs Pre-AIA Practice
Topic

AIA vs Pre-AIA Practice

5 rules
StatutoryInformativeAlways
[mpep-2304-02-c-930a143616a9e974a3dbcf7a]
Requirement for Substantially Same Subject Matter Before One-Year Period
Note:
An interference will not be declared unless at least one claim in the application, or a parent application, was for substantially the same subject matter as a patent claim within one year of the patent's issuance.

If an application claim interferes with a claim of a patent, and the claim was added to the application by an amendment filed more than one year after issuance of the patent, or the application was not filed until more than one year after issuance of the patent (but the patent is not a statutory bar), then under the provisions of pre-AIA 35 U.S.C. 135(b)(1), an interference will not be declared unless at least one of the claims which were in the application, or in a parent application, prior to expiration of the one-year period was for “substantially the same subject matter” as at least one of the claims of the patent. When the requisite relationship between post- and pre-critical date claims is otherwise established, the condition of pre-AIA 35 U.S.C. 135(b)(1) is met and there is no requirement of diligent prosecution. See In re Commonwealth Scientific, 632 Fed. App'x. 1024, 1026 (Fed. Cir. 2015) (nonprecedential) (“Application of § 135(b)(1) does not turn on the patent applicant’s prosecution decisions or require diligence in prosecution.”). Note that the expression “prior to one year from the date on which the patent was granted” in 35 U.S.C. 135(b) includes the one-year anniversary date of the issuance of a patent. See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964).

Jump to MPEP SourceAIA vs Pre-AIA PracticeAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryInformativeAlways
[mpep-2304-02-c-5f42a1d192b1c204dac031d2]
No Requirement for Diligent Prosecution When Pre- and Post-Critical Date Claims Are Related
Note:
If the relationship between post- and pre-critical date claims is established, there's no need to prove diligent prosecution under pre-AIA 35 U.S.C. 135(b)(1).

If an application claim interferes with a claim of a patent, and the claim was added to the application by an amendment filed more than one year after issuance of the patent, or the application was not filed until more than one year after issuance of the patent (but the patent is not a statutory bar), then under the provisions of pre-AIA 35 U.S.C. 135(b)(1), an interference will not be declared unless at least one of the claims which were in the application, or in a parent application, prior to expiration of the one-year period was for “substantially the same subject matter” as at least one of the claims of the patent. When the requisite relationship between post- and pre-critical date claims is otherwise established, the condition of pre-AIA 35 U.S.C. 135(b)(1) is met and there is no requirement of diligent prosecution. See In re Commonwealth Scientific, 632 Fed. App'x. 1024, 1026 (Fed. Cir. 2015) (nonprecedential) (“Application of § 135(b)(1) does not turn on the patent applicant’s prosecution decisions or require diligence in prosecution.”). Note that the expression “prior to one year from the date on which the patent was granted” in 35 U.S.C. 135(b) includes the one-year anniversary date of the issuance of a patent. See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964).

Jump to MPEP SourceAIA vs Pre-AIA PracticeAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryInformativeAlways
[mpep-2304-02-c-21454fb521710b517c5c16d5]
Application Filing Includes §120 Benefit
Note:
An application filed under §135(b)(2) includes the benefit provision of §120, allowing for priority claims without separate filing actions.

Similarly, in a subsequently filed application relative to an application published under 35 U.S.C. 122(b), if applicant does not appear to have a claim that is for “substantially the same subject matter” prior to one year after publication, in accordance with 35 U.S.C. 135(b)(2), an interference will not be declared. See Loughlin v. Ling, 684 F.3d 1289, 1294, 103 USPQ2d 1413, 1417 (Fed. Cir. 2012)(“an application filed” in § 135(b)(2) includes the benefit provision of § 120).

Jump to MPEP SourceAIA vs Pre-AIA PracticeAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryPermittedAlways
[mpep-2304-02-c-6ed330c29927e75ead054d78]
Claim Must Be Made Before Patent Issue Date
Note:
Form paragraph 23.14 permits rejecting a claim if it was not made prior to one year of the patent issue date.

Form paragraph 23.14 may be used to reject a claim as not being made prior to one year of the patent issue date. Form paragraph 23.14.01 may be used to reject a claim as not being made prior to one year from the application publication date.

Jump to MPEP SourceAIA vs Pre-AIA PracticeDerivation Proceedings (AIA)
StatutoryPermittedAlways
[mpep-2304-02-c-f45b3c368ce69fd30783d019]
Claim Must Be Made Before Publication One Year
Note:
Claims must be rejected if not made prior to one year from the application publication date.

Form paragraph 23.14 may be used to reject a claim as not being made prior to one year of the patent issue date. Form paragraph 23.14.01 may be used to reject a claim as not being made prior to one year from the application publication date.

Jump to MPEP SourceAIA vs Pre-AIA PracticeDerivation Proceedings (AIA)
Topic

Declaration of Interference

4 rules
StatutoryRequiredAlways
[mpep-2304-02-c-ff2eca1c0d2120f9ab960fa7]
Applicant Must Explain Priority for Interference
Note:
An applicant must provide detailed explanations and charts to establish priority when suggesting an interference with another application or patent.
(a) Applicant. An applicant, including a reissue applicant, may suggest an interference with another application or a patent. The suggestion must:
  • (4) Explain in detail why the applicant will prevail on priority,
  • *****
  • (6) For each constructive reduction to practice for which the applicant wishes to be accorded benefit, provide a chart showing where the disclosure provides a constructive reduction to practice within the scope of the interfering subject matter.
Jump to MPEP Source · 37 CFR 41.202Declaration of InterferenceInterference Proceedings (Pre-AIA)Requirements for Declaring Interference
StatutoryInformativeAlways
[mpep-2304-02-c-ca736c0ff2bda94ad5305985]
Applicant Must Prevail on Priority Claim
Note:
The applicant must provide sufficient evidence to demonstrate why they should prevail in a priority claim.

(a) Applicant. An applicant, including a reissue applicant, may suggest an interference with another application or a patent. The suggestion must (4) Explain in detail why the applicant will prevail on priority,

Jump to MPEP Source · 37 CFR 41.202Declaration of InterferenceInterference Proceedings (Pre-AIA)Reissue Patent Practice
StatutoryRequiredAlways
[mpep-2304-02-c-7b584b4a69073782b8acae13]
Requirement for Priority Showing
Note:
The rule requires showing priority, which may resemble the requirements under 37 CFR 1.130-1.132 but with different scope, and the examiner is not responsible for examining its substantive sufficiency.

The showing of priority may look similar to showings under 37 CFR 1.130 – 1.132, although there are differences particularly in the scope of what must be shown. In any case, with the exception discussed below, the examiner is not responsible for examining the substantive sufficiency of the showing.

Jump to MPEP Source · 37 CFR 1.130Declaration of InterferenceInterference Proceedings (Pre-AIA)
StatutoryInformativeAlways
[mpep-2304-02-c-b891351fed89f36cd8bd69a4]
Examiner Not Responsible for Substantive Sufficiency of Priority Showing
Note:
The examiner is not required to assess the adequacy of the priority showing, except as noted.

The showing of priority may look similar to showings under 37 CFR 1.130 – 1.132, although there are differences particularly in the scope of what must be shown. In any case, with the exception discussed below, the examiner is not responsible for examining the substantive sufficiency of the showing.

Jump to MPEP Source · 37 CFR 1.130Declaration of InterferenceInterference Proceedings (Pre-AIA)
Topic

Assignee as Applicant Signature

4 rules
StatutoryInformativeAlways
[mpep-2304-02-c-31dcf85e7f2a5878908299f4]
Interference Not Dependent on Prosecution Diligence
Note:
The application of pre-AIA 35 U.S.C. 135(b)(1) does not hinge on the patent applicant's prosecution decisions or require diligence in prosecution for interference proceedings.

If an application claim interferes with a claim of a patent, and the claim was added to the application by an amendment filed more than one year after issuance of the patent, or the application was not filed until more than one year after issuance of the patent (but the patent is not a statutory bar), then under the provisions of pre-AIA 35 U.S.C. 135(b)(1), an interference will not be declared unless at least one of the claims which were in the application, or in a parent application, prior to expiration of the one-year period was for “substantially the same subject matter” as at least one of the claims of the patent. When the requisite relationship between post- and pre-critical date claims is otherwise established, the condition of pre-AIA 35 U.S.C. 135(b)(1) is met and there is no requirement of diligent prosecution. See In re Commonwealth Scientific, 632 Fed. App'x. 1024, 1026 (Fed. Cir. 2015) (nonprecedential) (“Application of § 135(b)(1) does not turn on the patent applicant’s prosecution decisions or require diligence in prosecution.”). Note that the expression “prior to one year from the date on which the patent was granted” in 35 U.S.C. 135(b) includes the one-year anniversary date of the issuance of a patent. See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964).

Jump to MPEP SourceAssignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-ded752280903fe8434af8bee]
Interference Claims Must Be Substantially the Same Before Patent Issuance
Note:
Interference claims must be substantially the same as pre-issuance application claims within one year of patent issuance.

If an application claim interferes with a claim of a patent, and the claim was added to the application by an amendment filed more than one year after issuance of the patent, or the application was not filed until more than one year after issuance of the patent (but the patent is not a statutory bar), then under the provisions of pre-AIA 35 U.S.C. 135(b)(1), an interference will not be declared unless at least one of the claims which were in the application, or in a parent application, prior to expiration of the one-year period was for “substantially the same subject matter” as at least one of the claims of the patent. When the requisite relationship between post- and pre-critical date claims is otherwise established, the condition of pre-AIA 35 U.S.C. 135(b)(1) is met and there is no requirement of diligent prosecution. See In re Commonwealth Scientific, 632 Fed. App'x. 1024, 1026 (Fed. Cir. 2015) (nonprecedential) (“Application of § 135(b)(1) does not turn on the patent applicant’s prosecution decisions or require diligence in prosecution.”). Note that the expression “prior to one year from the date on which the patent was granted” in 35 U.S.C. 135(b) includes the one-year anniversary date of the issuance of a patent. See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964).

Jump to MPEP SourceAssignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-800d7902a33b205688294cb7]
Requirement for Substantially Same Subject Matter Before Interference
Note:
An interference will not be declared unless claims in the application before a one-year period were substantially the same as patent claims.

If an application claim interferes with a claim of a patent, and the claim was added to the application by an amendment filed more than one year after issuance of the patent, or the application was not filed until more than one year after issuance of the patent (but the patent is not a statutory bar), then under the provisions of pre-AIA 35 U.S.C. 135(b)(1), an interference will not be declared unless at least one of the claims which were in the application, or in a parent application, prior to expiration of the one-year period was for “substantially the same subject matter” as at least one of the claims of the patent. When the requisite relationship between post- and pre-critical date claims is otherwise established, the condition of pre-AIA 35 U.S.C. 135(b)(1) is met and there is no requirement of diligent prosecution. See In re Commonwealth Scientific, 632 Fed. App'x. 1024, 1026 (Fed. Cir. 2015) (nonprecedential) (“Application of § 135(b)(1) does not turn on the patent applicant’s prosecution decisions or require diligence in prosecution.”). Note that the expression “prior to one year from the date on which the patent was granted” in 35 U.S.C. 135(b) includes the one-year anniversary date of the issuance of a patent. See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964).

Jump to MPEP SourceAssignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2304-02-c-061ec36ab1d5a7bb251140cd]
Interference Not Declared If No Substantially Same Subject Matter
Note:
If a subsequently filed application does not claim substantially the same subject matter as a published application within one year, no interference will be declared.

Similarly, in a subsequently filed application relative to an application published under 35 U.S.C. 122(b), if applicant does not appear to have a claim that is for “substantially the same subject matter” prior to one year after publication, in accordance with 35 U.S.C. 135(b)(2), an interference will not be declared. See Loughlin v. Ling, 684 F.3d 1289, 1294, 103 USPQ2d 1413, 1417 (Fed. Cir. 2012)(“an application filed” in § 135(b)(2) includes the benefit provision of § 120).

Jump to MPEP SourceAssignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
Topic

Interference Proceedings (Pre-AIA)

2 rules
StatutoryInformativeAlways
[mpep-2304-02-c-b893e4a02a1e4c21c6c63c6d]
One Embodiment Can Anticipate Count
Note:
A single disclosed embodiment in an application is sufficient to anticipate the subject matter of a count in interference proceedings.

A description in an application that would have anticipated the subject matter of a count is called a constructive reduction-to-practice of the count. One disclosed embodiment is enough to have anticipated the subject matter of the count. If the application is relying on a chain of benefit disclosures under any of pre-AIA 35 U.S.C. 119, 120, 121 and 35 U.S.C. 365, then the anticipating disclosure must be continuously disclosed through the entire benefit chain or no benefit may be accorded. See Tas v. Beachy, 626 Fed. App'x. 999, 1002 (Fed. Cir. 2015) (nonprecedential) (when a party to an interference seeks the benefit of an earlier-filed U.S. patent application, the earlier application must contain a written description of the subject matter of the interference Count, and must meet the enablement requirement.); Hyatt v. Boone, 146 F.3d 1348, 1352, 47 USPQ2d 1128, 1130 (Fed. Cir. 1998).

Jump to MPEP Source · 37 CFR 41.202Interference Proceedings (Pre-AIA)Definition of CountInterference Count
StatutoryRequiredAlways
[mpep-2304-02-c-683df8bf110e5de16e98287d]
Anticipating Disclosure Must Be Continuously Disclosed Through Entire Benefit Chain
Note:
If an application relies on a chain of benefit disclosures, any anticipating disclosure must be present in each linked document to claim priority.

A description in an application that would have anticipated the subject matter of a count is called a constructive reduction-to-practice of the count. One disclosed embodiment is enough to have anticipated the subject matter of the count. If the application is relying on a chain of benefit disclosures under any of pre-AIA 35 U.S.C. 119, 120, 121 and 35 U.S.C. 365, then the anticipating disclosure must be continuously disclosed through the entire benefit chain or no benefit may be accorded. See Tas v. Beachy, 626 Fed. App'x. 999, 1002 (Fed. Cir. 2015) (nonprecedential) (when a party to an interference seeks the benefit of an earlier-filed U.S. patent application, the earlier application must contain a written description of the subject matter of the interference Count, and must meet the enablement requirement.); Hyatt v. Boone, 146 F.3d 1348, 1352, 47 USPQ2d 1128, 1130 (Fed. Cir. 1998).

Jump to MPEP Source · 37 CFR 41.202Interference Proceedings (Pre-AIA)Definition of CountInterference Count
Topic

Constructive Reduction (Filing)

2 rules
StatutoryPermittedAlways
[mpep-2304-02-c-f302d521249b0758f82d4935]
Constructive Reduction to Practice Priority
Note:
If an application has an earlier constructive reduction-to-practice than another, the applicant can claim priority without additional proof.

If the application has an earlier constructive reduction-to-practice than the apparent earliest constructive reduction-to-practice of the other application or patent, then the applicant may simply explain its entitlement to its earlier constructive reduction-to-practice. Otherwise, the applicant must (A) antedate the earliest constructive reduction-to-practice of the other application or patent, (B) demonstrate why the other application or patent is not entitled to its apparent earliest constructive reduction-to-practice, or (C) provide some other reason why the applicant should be considered the prior inventor.

Jump to MPEP Source · 37 CFR 41.202Constructive Reduction (Filing)Reduction to PracticeInterference Proceedings (Pre-AIA)
StatutoryRequiredAlways
[mpep-2304-02-c-3e0cab1e9e7b05d9f8f1ea0e]
Prior Inventor Must Antedate Other Application’s Constructive Reduction
Note:
The applicant must show their invention was reduced to practice before the other application or demonstrate why the other application does not qualify.

If the application has an earlier constructive reduction-to-practice than the apparent earliest constructive reduction-to-practice of the other application or patent, then the applicant may simply explain its entitlement to its earlier constructive reduction-to-practice. Otherwise, the applicant must (A) antedate the earliest constructive reduction-to-practice of the other application or patent, (B) demonstrate why the other application or patent is not entitled to its apparent earliest constructive reduction-to-practice, or (C) provide some other reason why the applicant should be considered the prior inventor.

Jump to MPEP Source · 37 CFR 41.202Constructive Reduction (Filing)Reduction to PracticePriority in Interference
Topic

Requirements for Declaring Interference

1 rules
StatutoryInformativeAlways
[mpep-2304-02-c-7d6fc3ce74b35eab5b5c503b]
Disclosure Must Show Constructive Reduction to Practice
Note:
Applicants must provide a chart demonstrating where the disclosure shows a constructive reduction to practice within the interfering subject matter for each claimed benefit.

(a) Applicant. An applicant, including a reissue applicant, may suggest an interference with another application or a patent. The suggestion must:

(6) For each constructive reduction to practice for which the applicant wishes to be accorded benefit, provide a chart showing where the disclosure provides a constructive reduction to practice within the scope of the interfering subject matter.

Jump to MPEP Source · 37 CFR 41.202Requirements for Declaring InterferenceInterference Proceedings (Pre-AIA)Declaration of Interference
Topic

Definition of Count

1 rules
StatutoryInformativeAlways
[mpep-2304-02-c-3620b1be030ca3fd86240fca]
Description Anticipating Count Is Constructive Practice
Note:
A description in an application that anticipates the subject matter of a count is considered a constructive reduction-to-practice. One embodiment suffices, and if relying on benefit chain, all must continuously disclose the required information.

A description in an application that would have anticipated the subject matter of a count is called a constructive reduction-to-practice of the count. One disclosed embodiment is enough to have anticipated the subject matter of the count. If the application is relying on a chain of benefit disclosures under any of pre-AIA 35 U.S.C. 119, 120, 121 and 35 U.S.C. 365, then the anticipating disclosure must be continuously disclosed through the entire benefit chain or no benefit may be accorded. See Tas v. Beachy, 626 Fed. App'x. 999, 1002 (Fed. Cir. 2015) (nonprecedential) (when a party to an interference seeks the benefit of an earlier-filed U.S. patent application, the earlier application must contain a written description of the subject matter of the interference Count, and must meet the enablement requirement.); Hyatt v. Boone, 146 F.3d 1348, 1352, 47 USPQ2d 1128, 1130 (Fed. Cir. 1998).

Jump to MPEP Source · 37 CFR 41.202Definition of CountInterference Proceedings (Pre-AIA)Interference Count
Topic

Interference Count

1 rules
StatutoryRequiredAlways
[mpep-2304-02-c-e7c52607c9607c60687345d9]
Written Description and Enablement Required for Earlier-Filed U.S. Patent Application in Interference Count
Note:
When a party to an interference seeks the benefit of an earlier-filed U.S. patent application, that application must contain a written description of the subject matter of the count and meet the enablement requirement.

A description in an application that would have anticipated the subject matter of a count is called a constructive reduction-to-practice of the count. One disclosed embodiment is enough to have anticipated the subject matter of the count. If the application is relying on a chain of benefit disclosures under any of pre-AIA 35 U.S.C. 119, 120, 121 and 35 U.S.C. 365, then the anticipating disclosure must be continuously disclosed through the entire benefit chain or no benefit may be accorded. See Tas v. Beachy, 626 Fed. App'x. 999, 1002 (Fed. Cir. 2015) (nonprecedential) (when a party to an interference seeks the benefit of an earlier-filed U.S. patent application, the earlier application must contain a written description of the subject matter of the interference Count, and must meet the enablement requirement.); Hyatt v. Boone, 146 F.3d 1348, 1352, 47 USPQ2d 1128, 1130 (Fed. Cir. 1998).

Jump to MPEP Source · 37 CFR 41.202Interference CountInterference Proceedings (Pre-AIA)Definition of Count
Topic

Antedating Reference – Pre-AIA (MPEP 2136.05)

1 rules
StatutoryRequiredAlways
[mpep-2304-02-c-e44f46a7f02f8a05da15fdbe]
Examiner Must Verify Suggestion Overcomes Rejection
Note:
The examiner must review the applicant's suggestion to ensure it is sufficient to overcome a pre-AIA 35 U.S.C. 102(a) or 102(e) rejection.

If an application claim is subject to a rejection under pre-AIA 35 U.S.C. 102(a) or 102(e) and the applicant files a suggestion under 37 CFR 41.202(a) rather than a declaration under 37 CFR 1.130 – 1.132, then the examiner must review the suggestion to verify that the applicant’s showing, taken at face value, is sufficient to overcome the rejection. If the examiner determines that the showing is not sufficient, then the examination is not completed, and in accordance with 37 CFR 41.102, the rejection should be maintained and the suggestion should not be referred to the Board for an interference.

Jump to MPEP Source · 37 CFR 41.202(a)Antedating Reference – Pre-AIA (MPEP 2136.05)Assignee as Applicant SignatureApplicant and Assignee Filing Under AIA
Topic

PTAB Jurisdiction

1 rules
StatutoryRecommendedAlways
[mpep-2304-02-c-3b1b07f8cc11a33d14f0bd2a]
Examiner Must Maintain Rejection If Showing Insufficient
Note:
If the examiner determines that the applicant’s showing is not sufficient to overcome a rejection, the examination is not completed and the rejection should be maintained without referral to the Board for an interference.

If an application claim is subject to a rejection under pre-AIA 35 U.S.C. 102(a) or 102(e) and the applicant files a suggestion under 37 CFR 41.202(a) rather than a declaration under 37 CFR 1.130 – 1.132, then the examiner must review the suggestion to verify that the applicant’s showing, taken at face value, is sufficient to overcome the rejection. If the examiner determines that the showing is not sufficient, then the examination is not completed, and in accordance with 37 CFR 41.102, the rejection should be maintained and the suggestion should not be referred to the Board for an interference.

Jump to MPEP Source · 37 CFR 41.202(a)PTAB JurisdictionPTAB Contested Case ProceduresAntedating Reference – Pre-AIA (MPEP 2136.05)

Examiner Form Paragraphs

Examiner form paragraphs are standard language that you might see in an Office Action or communication from the USPTO. Examiners have latitude to change the form paragraphs, but you will often see this exact language.

¶ 23.14 ¶ 23.14 Claims Not Copied Within One Year of Patent Issue Date

Citations

Primary topicCitation
Antedating Reference – Pre-AIA (MPEP 2136.05)
PTAB Jurisdiction
35 U.S.C. § 102(a)
Definition of Count
Interference Count
Interference Proceedings (Pre-AIA)
35 U.S.C. § 119
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
35 U.S.C. § 120
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
35 U.S.C. § 122(b)
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
Obviousness
35 U.S.C. § 135(b)
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
35 U.S.C. § 135(b)(1)
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
35 U.S.C. § 135(b)(2)
Definition of Count
Interference Count
Interference Proceedings (Pre-AIA)
35 U.S.C. § 365
Antedating Reference – Pre-AIA (MPEP 2136.05)
Declaration of Interference
PTAB Jurisdiction
37 CFR § 1.130
Antedating Reference – Pre-AIA (MPEP 2136.05)
PTAB Jurisdiction
37 CFR § 41.102
Antedating Reference – Pre-AIA (MPEP 2136.05)
PTAB Jurisdiction
37 CFR § 41.202(a)
AIA vs Pre-AIA PracticeForm Paragraph § 23.14
AIA vs Pre-AIA PracticeForm Paragraph § 23.14.01
Definition of Count
Interference Count
Interference Proceedings (Pre-AIA)
Hyatt v. Boone, 146 F.3d 1348, 1352, 47 USPQ2d 1128, 1130 (Fed. Cir. 1998)
ObviousnessIn re Berger, 279 F.3d 975, 61 USPQ2d 1523 (Fed. Cir. 2002)
ObviousnessIn re McGrew, 120 F.3d 1236, 43 USPQ2d 1632 (Fed. Cir. 1997)
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
See Loughlin v. Ling, 684 F.3d 1289, 1294, 103 USPQ2d 1413, 1417 (Fed. Cir. 2012)
AIA vs Pre-AIA Practice
Assignee as Applicant Signature
See Switzer v. Sockman, 333 F.2d 935, 142 USPQ 226 (CCPA 1964)

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: 2025-12-31