MPEP § 718 — Affidavit or Declaration to Disqualify Commonly Owned Patent as Prior Art, 37 CFR 1.131(c) (Annotated Rules)

§718 Affidavit or Declaration to Disqualify Commonly Owned Patent as Prior Art, 37 CFR 1.131(c)

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

This page consolidates and annotates all enforceable requirements under MPEP § 718, 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.

Affidavit or Declaration to Disqualify Commonly Owned Patent as Prior Art, 37 CFR 1.131(c)

This section addresses Affidavit or Declaration to Disqualify Commonly Owned Patent as Prior Art, 37 CFR 1.131(c). Primary authority: 35 U.S.C. 104, 35 U.S.C. 103(c), and 37 CFR 1.131(c). Contains: 1 requirement, 3 prohibitions, and 1 other statement.

Key Rules

Topic

Inventor's Oath/Declaration Requirements

3 rules
StatutoryInformativeAlways
[mpep-718-9ed45f3e43b03b6e11b72fed]
Inventor's Oath/Declaration Required for Nonstatutory Double Patenting
Note:
An inventor must provide an oath or declaration stating they were the prior inventor before the actual date of invention to disqualify a commonly owned patent as prior art.

As 37 CFR 1.131(c) addresses those situations in which the inventions defined by the claims in the application or patent under reexamination and by the claims in the U.S. patent or patent application publication are not patentably distinct, 37 CFR 1.131(c)(1) requires a terminal disclaimer in accordance with 37 CFR 1.321(c), and 37 CFR 1.131(c)(2) requires an oath or declaration stating, inter alia, that the inventor named in the application or patent under reexamination is the prior inventor under pre-AIA 35 U.S.C. 104. The inventor named in the application or patent under reexamination must have invented the claimed subject matter before the actual date of invention of the subject matter of the reference claims. The affidavit or declaration may be signed by the inventor(s), the attorney or agent of record, or assignee(s) of the entire interest. It is noted that a terminal disclaimer is only effective in overcoming a nonstatutory double patenting rejection and cannot be used to overcome statutory double patenting. See MPEP § 804, subsection I.B.2.

Jump to MPEP Source · 37 CFR 1.131(c)Inventor's Oath/Declaration RequirementsContent of Patent Application PublicationInventor Signature Requirements
StatutoryRequiredAlways
[mpep-718-8b6da3c980ed60b808bf8c9c]
Inventor Named Must Have Invented Before Reference Date
Note:
The inventor named in the application must have actually invented the claimed subject matter before the date of invention of the reference claims.

As 37 CFR 1.131(c) addresses those situations in which the inventions defined by the claims in the application or patent under reexamination and by the claims in the U.S. patent or patent application publication are not patentably distinct, 37 CFR 1.131(c)(1) requires a terminal disclaimer in accordance with 37 CFR 1.321(c), and 37 CFR 1.131(c)(2) requires an oath or declaration stating, inter alia, that the inventor named in the application or patent under reexamination is the prior inventor under pre-AIA 35 U.S.C. 104. The inventor named in the application or patent under reexamination must have invented the claimed subject matter before the actual date of invention of the subject matter of the reference claims. The affidavit or declaration may be signed by the inventor(s), the attorney or agent of record, or assignee(s) of the entire interest. It is noted that a terminal disclaimer is only effective in overcoming a nonstatutory double patenting rejection and cannot be used to overcome statutory double patenting. See MPEP § 804, subsection I.B.2.

Jump to MPEP Source · 37 CFR 1.131(c)Inventor's Oath/Declaration RequirementsContent of Patent Application PublicationInventor Signature Requirements
StatutoryProhibitedAlways
[mpep-718-a7f9a82a94026b35d82cd005]
Oath or Declaration Requirement for Prior Invention
Note:
The inventor(s) must sign an oath or declaration stating they are the prior inventors, and it can also be signed by the attorney or agent of record or assignee(s).

As 37 CFR 1.131(c) addresses those situations in which the inventions defined by the claims in the application or patent under reexamination and by the claims in the U.S. patent or patent application publication are not patentably distinct, 37 CFR 1.131(c)(1) requires a terminal disclaimer in accordance with 37 CFR 1.321(c), and 37 CFR 1.131(c)(2) requires an oath or declaration stating, inter alia, that the inventor named in the application or patent under reexamination is the prior inventor under pre-AIA 35 U.S.C. 104. The inventor named in the application or patent under reexamination must have invented the claimed subject matter before the actual date of invention of the subject matter of the reference claims. The affidavit or declaration may be signed by the inventor(s), the attorney or agent of record, or assignee(s) of the entire interest. It is noted that a terminal disclaimer is only effective in overcoming a nonstatutory double patenting rejection and cannot be used to overcome statutory double patenting. See MPEP § 804, subsection I.B.2.

Jump to MPEP Source · 37 CFR 1.131(c)Inventor's Oath/Declaration RequirementsInventor Signature RequirementsSignature Requirements
Topic

Assignee as Applicant Signature

2 rules
StatutoryInformativeAlways
[mpep-718-714aeadfe1fa4802a47bb8f7]
Interference Not Allowed Between Commonly Owned Applications and Patents
Note:
An interference will not be declared or continued between applications or an application and an unexpired patent that are commonly owned.

37 CFR 1.131(c) addresses those situations in which the rejection in an application or patent under reexamination to be overcome is a rejection under 35 U.S.C. 103 (based on prior art under pre-AIA 35 U.S.C. 102) in view of a U.S. patent or U.S. patent application publication which is not prior art under pre-AIA 35 U.S.C. 102(b) due to the requirement in 37 CFR 1.131(a) that any U.S. patent or U.S. patent application publication to be antedated not claim interfering subject matter (as defined in 37 CFR 41.203(a)) as the application or patent under reexamination. The applicant or patent owner is also prevented from proceeding in an interference due to the provision in 37 CFR 41.206 that an interference will not normally be declared or continued between applications that are commonly owned, or an application and an unexpired patent that are commonly owned.

Jump to MPEP Source · 37 CFR 1.131(c)Assignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
StatutoryProhibitedAlways
[mpep-718-e49c7ce6633dfc969eb4a0af]
Requirement for Prior Invention Date
Note:
The rule requires that the inventor named in the application be the prior inventor, establishing a specific date of invention based on country membership and dates.
The phrase “prior inventor under 35 U.S.C. 104 as in effect on March 15, 2013” requires that the inventor named in the application or patent be the prior inventor within the meaning of pre-AIA 35 U.S.C. 104, in that an applicant or patent owner may not:
  • (A) establish a date of invention in a foreign country other than a NAFTA or WTO member country;
  • (B) establish a date of invention in a WTO member country other than a NAFTA country earlier than January 1, 1996; or
  • (C) establish a date of invention in a NAFTA country other than the U.S. earlier than December 8, 1993.
Jump to MPEP Source · 37 CFR 1.131Assignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
Topic

First Inventor to File (FITF) System

1 rules
StatutoryInformativeAlways
[mpep-718-286773c8dbca9fbf466fb237]
Not Applicable to FITF Applications
Note:
This rule does not apply to applications subject to examination under the first inventor to file provisions of the AIA.

[Editor Note: This MPEP section is not applicable to applications subject to examination under the first inventor to file provisions of the AIA as explained in 35 U.S.C. 100 (note) and MPEP § 2159.]

Jump to MPEP SourceFirst Inventor to File (FITF) SystemAIA vs Pre-AIA PracticeInventor's Oath/Declaration Requirements
Topic

Determining Whether Application Is AIA or Pre-AIA

1 rules
StatutoryInformativeAlways
[mpep-718-4c5e84c4a71391f96bfe662f]
Subject Matter Owned by Same Person Is Not Prior Art
Note:
The rule states that subject matter and the claimed invention, owned by the same person at the time of invention, cannot be considered prior art under pre-AIA 35 U.S.C. 103(c).

See MPEP §§ 804.03 and 2146 – 2146.03 for subject matter disqualified as prior art under pre-AIA 35 U.S.C. 103(c) where the subject matter 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.

Jump to MPEP Source · 37 CFR 1.131Determining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)Obviousness Under AIA (MPEP 2158)
Topic

AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)

1 rules
StatutoryInformativeAlways
[mpep-718-45557c446ccffda694339046]
Requirement for Overcoming 103 Rejection Based on Non-Prior Art
Note:
This rule requires overcoming a rejection under 35 U.S.C. 103 based on a U.S. patent or publication that is not considered prior art due to the antedating requirement in 37 CFR 1.131(a).

37 CFR 1.131(c) addresses those situations in which the rejection in an application or patent under reexamination to be overcome is a rejection under 35 U.S.C. 103 (based on prior art under pre-AIA 35 U.S.C. 102) in view of a U.S. patent or U.S. patent application publication which is not prior art under pre-AIA 35 U.S.C. 102(b) due to the requirement in 37 CFR 1.131(a) that any U.S. patent or U.S. patent application publication to be antedated not claim interfering subject matter (as defined in 37 CFR 41.203(a)) as the application or patent under reexamination. The applicant or patent owner is also prevented from proceeding in an interference due to the provision in 37 CFR 41.206 that an interference will not normally be declared or continued between applications that are commonly owned, or an application and an unexpired patent that are commonly owned.

Jump to MPEP Source · 37 CFR 1.131(c)AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)Antedating Reference – Pre-AIA (MPEP 2136.05)Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Topic

Obviousness Under AIA (MPEP 2158)

1 rules
StatutoryProhibitedAlways
[mpep-718-9b3092b29bf1a9277f052087]
Anticipating Patent Cannot Be Disqualified as Prior Art
Note:
A U.S. patent or application that anticipates the claimed invention cannot be disqualified from being considered prior art under pre-AIA 35 U.S.C. 103(c) or 37 CFR 1.131(c).

A U.S. patent or U.S. patent application publication that anticipates the claimed subject matter cannot be disqualified as prior art under pre-AIA 35 U.S.C. 103(c) or 37 CFR 1.131(c).

Jump to MPEP Source · 37 CFR 1.131(c)Obviousness Under AIA (MPEP 2158)Obviousness Under Pre-AIA (MPEP 2141-2146)AIA vs Pre-AIA Practice

Citations

Primary topicCitation
First Inventor to File (FITF) System35 U.S.C. § 100
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
35 U.S.C. § 102
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
35 U.S.C. § 102(b)
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
35 U.S.C. § 103
Determining Whether Application Is AIA or Pre-AIA
Obviousness Under AIA (MPEP 2158)
35 U.S.C. § 103(c)
Assignee as Applicant Signature
Inventor's Oath/Declaration Requirements
35 U.S.C. § 104
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
37 CFR § 1.131(a)
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
Inventor's Oath/Declaration Requirements
Obviousness Under AIA (MPEP 2158)
37 CFR § 1.131(c)
Inventor's Oath/Declaration Requirements37 CFR § 1.131(c)(1)
Inventor's Oath/Declaration Requirements37 CFR § 1.131(c)(2)
Inventor's Oath/Declaration Requirements37 CFR § 1.321(c)
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
37 CFR § 41.203(a)
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
37 CFR § 41.206
First Inventor to File (FITF) SystemMPEP § 2159
Inventor's Oath/Declaration RequirementsMPEP § 804
Determining Whether Application Is AIA or Pre-AIAMPEP § 804.03

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