MPEP § 2302 — Consult an Interference Practice Specialist (Annotated Rules)

§2302 Consult an Interference Practice Specialist

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

This page consolidates and annotates all enforceable requirements under MPEP § 2302, 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.

Consult an Interference Practice Specialist

This section addresses Consult an Interference Practice Specialist. Primary authority: 35 U.S.C. 102(e)), 35 U.S.C. 102(e), and 35 U.S.C. 132. Contains: 8 requirements, 2 guidance statements, 2 permissions, and 1 other statement.

Key Rules

Topic

Interference Proceedings (Pre-AIA)

9 rules
StatutoryRecommendedAlways
[mpep-2302-a2ff45eee10691488a3def99]
Examiner Must Notify IPS of Interference Issues
Note:
An examiner must inform an IPS in their TC when they become aware of a potential interference or any other interference issue during application prosecution.

In an effort to maximize uniformity, when an examiner first becomes aware that a potential interference exists or any other interference issue arises during prosecution of an application, the examiner should bring the matter to the attention of an IPS in the examiner’s TC.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
StatutoryPermittedAlways
[mpep-2302-67a003745ec3d73779d42a36]
Brief Period for Second Application to Meet Allowance Conditions
Note:
The examiner may allow the second applicant a brief period to modify their application by canceling rejected claims, ensuring it interferes with the first application's claims.

Without suspending action in the first application and after consultation consistent with Practice 1 above, the examiner may wish to give the second applicant a very brief period of time within which to put the second application in condition for allowance, e.g., by canceling rejected claims thereby leaving only allowable claims which interfere with the claims of the first application.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
StatutoryRequiredAlways
[mpep-2302-c1882c15fcac2a98dcbfa74d]
Application with Earliest Effective Filing Date Must Be Issued
Note:
If both applications are in condition for allowance and their filing dates differ by more than six months, the one with the earlier date must be issued while the later one is rejected.

If the applications are both in condition for allowance and earliest effective filing dates of the applications are not within six months of each other, the application with the earliest effective filing date shall be issued. The application with the later filing date shall be rejected on the basis of the application with the earliest effective filing date. Further action in the application with the later filing date will be governed by prosecution in that application. If the applicant in the application with the later filing date makes the showing required by 37 CFR 41.202(d), an application versus patent interference may be declared. If no rejection is possible over the patent issuing from the application with the earliest effective filing date, then the applicant must still be required under 35 U.S.C. 132 to make the priority showing required in 37 CFR 41.202(d).

Jump to MPEP Source · 37 CFR 41.202(d)Interference Proceedings (Pre-AIA)Interference with Issued PatentDeclaration of Interference
StatutoryRequiredAlways
[mpep-2302-426af2e82d08dd36e3fb814e]
Application with Later Filing Date Must Be Rejected Based on Earliest Effective Filing Date
Note:
If the applications are both in condition for allowance and earliest effective filing dates are not within six months of each other, the application with the later filing date must be rejected based on the one with the earliest effective filing date.

If the applications are both in condition for allowance and earliest effective filing dates of the applications are not within six months of each other, the application with the earliest effective filing date shall be issued. The application with the later filing date shall be rejected on the basis of the application with the earliest effective filing date. Further action in the application with the later filing date will be governed by prosecution in that application. If the applicant in the application with the later filing date makes the showing required by 37 CFR 41.202(d), an application versus patent interference may be declared. If no rejection is possible over the patent issuing from the application with the earliest effective filing date, then the applicant must still be required under 35 U.S.C. 132 to make the priority showing required in 37 CFR 41.202(d).

Jump to MPEP Source · 37 CFR 41.202(d)Interference Proceedings (Pre-AIA)Interference with Issued PatentDeclaration of Interference
StatutoryInformativeAlways
[mpep-2302-c0f080f7932d730be279a86b]
Further Action Governed by Later Application
Note:
Further prosecution in the application with the later filing date will follow the procedures of that application.

If the applications are both in condition for allowance and earliest effective filing dates of the applications are not within six months of each other, the application with the earliest effective filing date shall be issued. The application with the later filing date shall be rejected on the basis of the application with the earliest effective filing date. Further action in the application with the later filing date will be governed by prosecution in that application. If the applicant in the application with the later filing date makes the showing required by 37 CFR 41.202(d), an application versus patent interference may be declared. If no rejection is possible over the patent issuing from the application with the earliest effective filing date, then the applicant must still be required under 35 U.S.C. 132 to make the priority showing required in 37 CFR 41.202(d).

Jump to MPEP Source · 37 CFR 41.202(d)Interference Proceedings (Pre-AIA)Interference with Issued PatentDeclaration of Interference
StatutoryRequiredAlways
[mpep-2302-d660ae1fc55fc7e2e3635e94]
Consultation Before Suspension of Prosecution
Note:
A consultation with an Interference Practice Specialist is required before suspending prosecution pending possible interference.

Suspension of prosecution pending a possible interference should be rare and should not be entered prior to the consultation required by Practice 1 above.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
MPEP GuidanceInformativeAlways
[mpep-2302-d9023ee1c2260b1174a9dc0f]
Interference Practice Specialist Must Consult APJs When Necessary
Note:
Examiners must consult administrative patent judges for interference practice when necessary, ensuring they stay current on interference procedures.

IPSs consult with administrative patent judges (APJs) that declare interferences to stay current in interference practice. When necessary, an IPS may arrange for a consultation with an APJ to discuss a suggested interference or the effect of a completed interference. Examiners must promptly address inquiries or requests from an IPS regarding a suggested interference.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
MPEP GuidancePermittedAlways
[mpep-2302-ec052c7ea21dea6949b60a94]
IPS May Arrange APJ Consultation for Interference
Note:
An IPS may consult with an APJ to discuss a suggested interference or the effect of a completed interference when necessary.

IPSs consult with administrative patent judges (APJs) that declare interferences to stay current in interference practice. When necessary, an IPS may arrange for a consultation with an APJ to discuss a suggested interference or the effect of a completed interference. Examiners must promptly address inquiries or requests from an IPS regarding a suggested interference.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
MPEP GuidanceRequiredAlways
[mpep-2302-bc740cdec2346811bc99a2c2]
Examiners Must Promptly Address IPS Inquiries on Suggested Interference
Note:
Examiners are required to promptly respond to inquiries or requests from an IPS regarding a suggested interference, ensuring timely communication and adherence to interference practice.

IPSs consult with administrative patent judges (APJs) that declare interferences to stay current in interference practice. When necessary, an IPS may arrange for a consultation with an APJ to discuss a suggested interference or the effect of a completed interference. Examiners must promptly address inquiries or requests from an IPS regarding a suggested interference.

Jump to MPEP SourceInterference Proceedings (Pre-AIA)
Topic

PTAB Jurisdiction

3 rules
MPEP GuidanceRequiredAlways
[mpep-2302-957d61b2fbdc5b9363b4a0d9]
IPS Must Be Consulted for Interference Suggestion to Board
Note:
An Interference Practice Specialist must be consulted when suggesting an interference to the Board.

Technology Centers (TCs) have at least one Interference Practice Specialist (IPS), who must be consulted when suggesting an interference to the Board.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
MPEP GuidanceRequiredAlways
[mpep-2302-44ecbb8e68aa5f1a66c78645]
IPS Must Approve Referral to Board
Note:
An IPS must approve any referral of a suggested interference to the Board and ensure it includes a completed Form PTO-850 signed by either an IPS or a Director of the examiner’s TC.

An IPS must approve any referral of a suggested interference to the Board. The referral must include a completed Form PTO-850, which either an IPS or a Director of the examiner’s TC must sign.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
MPEP GuidanceRequiredAlways
[mpep-2302-688b9226f3fd3014886f437d]
IPS or TC Director Must Sign Referral Form PTO-850
Note:
An IPS or the Director of the examiner’s TC must sign a completed Form PTO-850 when referring an interference to the Board for approval.

An IPS must approve any referral of a suggested interference to the Board. The referral must include a completed Form PTO-850, which either an IPS or a Director of the examiner’s TC must sign.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresInterference Proceedings (Pre-AIA)
Topic

Prior Art Under AIA 35 U.S.C. 102 (MPEP 2150-2159)

1 rules
StatutoryInformativeAlways
[mpep-2302-31644e7e42e6755db83e7835]
Requirement for Pre-AIA 35 U.S.C. 102(g)
Note:
This rule outlines the requirements for applications subject to pre-AIA 35 U.S.C. 102(g), ensuring compliance with specific prior art considerations.

FOR APPLICATIONS SUBJECT TO PRE-AIA 35 U.S.C. 102(g)

Jump to MPEP SourcePrior Art Under AIA 35 U.S.C. 102 (MPEP 2150-2159)Prior Art Under Pre-AIA 35 U.S.C. 102 (MPEP 2131-2138)AIA vs Pre-AIA 102 (MPEP 2151)
Topic

Notice of Allowance

1 rules
StatutoryRecommendedAlways
[mpep-2302-987373a8c87a089b14eb15e3]
First Application Requires Notice of Allowance to Issue Patent
Note:
A notice of allowance must be entered in the first application for it to become a patent.

then generally a notice of allowance should be entered in the first application and it should become a patent.

Jump to MPEP SourceNotice of AllowancePatent Issue and PublicationInterference Proceedings (Pre-AIA)
Topic

Statutory Authority for Examination

1 rules
StatutoryPermittedAlways
[mpep-2302-8c14011d186debe256046920]
Interference May Be Filed After Second Application Examined
Note:
An interference proceeding can be initiated after the examination of the second application is complete.

When examination of the second application is complete, an application versus patent interference may be appropriate.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresInterference Proceedings (Pre-AIA)
Topic

Assignee as Applicant Signature

1 rules
StatutoryRequiredAlways
[mpep-2302-314f90afef597b2e6a7938df]
Interference May Be Suggested for Applications with Close Filing Dates
Note:
If two applications are in condition for allowance and their earliest filing dates are within six months, an interference may be suggested if the later-filed application meets certain requirements.

When two applications are in condition for allowance and the earliest effective filing dates of the applications are within six months of each other, an application versus application interference may be suggested, provided the applicant with the later filing date makes the showing required by 37 CFR 41.202(d). Note that if the earliest filed application is available as a reference (for example, as a published application under pre-AIA 35 U.S.C. 102(e)) against the other application, then a rejection should be made against the other application. Ideally, the rejection would be made early in the prosecution, but if it is not and as a result the junior application is not in condition for allowance, then the senior application should be issued. In light of patent term adjustments it is no longer appropriate to suspend an application on the chance that an interference might ultimately result.

Jump to MPEP Source · 37 CFR 41.202(d)Assignee as Applicant SignatureApplicant and Assignee Filing Under AIAAIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Topic

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

1 rules
StatutoryRecommendedAlways
[mpep-2302-66c3c31947df5f8e08b8cc2b]
Rejection Based on Earliest Filed Application
Note:
If the earliest filed application is available as a reference against another application, a rejection should be made against that other application.

When two applications are in condition for allowance and the earliest effective filing dates of the applications are within six months of each other, an application versus application interference may be suggested, provided the applicant with the later filing date makes the showing required by 37 CFR 41.202(d). Note that if the earliest filed application is available as a reference (for example, as a published application under pre-AIA 35 U.S.C. 102(e)) against the other application, then a rejection should be made against the other application. Ideally, the rejection would be made early in the prosecution, but if it is not and as a result the junior application is not in condition for allowance, then the senior application should be issued. In light of patent term adjustments it is no longer appropriate to suspend an application on the chance that an interference might ultimately result.

Jump to MPEP Source · 37 CFR 41.202(d)AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)Provisional RightsPublished Application as Prior Art
Topic

Patent Term Basics

1 rules
StatutoryRecommendedAlways
[mpep-2302-3b85a9448d7b5c6d331d1ede]
Senior Application to Issue if Junior Not Allowable
Note:
If the junior application is not in condition for allowance, the senior application should be issued despite patent term adjustments.

When two applications are in condition for allowance and the earliest effective filing dates of the applications are within six months of each other, an application versus application interference may be suggested, provided the applicant with the later filing date makes the showing required by 37 CFR 41.202(d). Note that if the earliest filed application is available as a reference (for example, as a published application under pre-AIA 35 U.S.C. 102(e)) against the other application, then a rejection should be made against the other application. Ideally, the rejection would be made early in the prosecution, but if it is not and as a result the junior application is not in condition for allowance, then the senior application should be issued. In light of patent term adjustments it is no longer appropriate to suspend an application on the chance that an interference might ultimately result.

Jump to MPEP Source · 37 CFR 41.202(d)Patent Term BasicsPatent TermAIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Topic

Interference with Issued Patent

1 rules
StatutoryRequiredAlways
[mpep-2302-f298a9bdf895adf550dae282]
Interference May Be Declared If Later Application Shows Priority
Note:
If the applicant of the later filing date application demonstrates priority as required by 37 CFR 41.202(d), an interference proceeding may be initiated.

If the applications are both in condition for allowance and earliest effective filing dates of the applications are not within six months of each other, the application with the earliest effective filing date shall be issued. The application with the later filing date shall be rejected on the basis of the application with the earliest effective filing date. Further action in the application with the later filing date will be governed by prosecution in that application. If the applicant in the application with the later filing date makes the showing required by 37 CFR 41.202(d), an application versus patent interference may be declared. If no rejection is possible over the patent issuing from the application with the earliest effective filing date, then the applicant must still be required under 35 U.S.C. 132 to make the priority showing required in 37 CFR 41.202(d).

Jump to MPEP Source · 37 CFR 41.202(d)Interference with Issued PatentDeclaration of InterferenceInterference Proceedings (Pre-AIA)
Topic

Declaration of Interference

1 rules
StatutoryRequiredAlways
[mpep-2302-42ffc902c7f786f4355c8506]
Priority Showing Requirement Despite No Rejection Possible
Note:
The applicant must still provide the priority showing required by 37 CFR 41.202(d) even if no rejection can be made over the patent from the application with the earliest effective filing date.

If the applications are both in condition for allowance and earliest effective filing dates of the applications are not within six months of each other, the application with the earliest effective filing date shall be issued. The application with the later filing date shall be rejected on the basis of the application with the earliest effective filing date. Further action in the application with the later filing date will be governed by prosecution in that application. If the applicant in the application with the later filing date makes the showing required by 37 CFR 41.202(d), an application versus patent interference may be declared. If no rejection is possible over the patent issuing from the application with the earliest effective filing date, then the applicant must still be required under 35 U.S.C. 132 to make the priority showing required in 37 CFR 41.202(d).

Jump to MPEP Source · 37 CFR 41.202(d)Declaration of InterferenceInterference Proceedings (Pre-AIA)Interference with Issued Patent

Citations

Primary topicCitation
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
Patent Term Basics
35 U.S.C. § 102(e)
Prior Art Under AIA 35 U.S.C. 102 (MPEP 2150-2159)35 U.S.C. § 102(g)
Declaration of Interference
Interference Proceedings (Pre-AIA)
Interference with Issued Patent
35 U.S.C. § 132
AIA 102(a)(2) – Earlier Filed Applications (MPEP 2154)
Assignee as Applicant Signature
Declaration of Interference
Interference Proceedings (Pre-AIA)
Interference with Issued Patent
Patent Term Basics
37 CFR § 41.202(d)

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