MPEP § 2304.04(a) — Interfering Claim Already in Application (Annotated Rules)

§2304.04(a) Interfering Claim Already in Application

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

This page consolidates and annotates all enforceable requirements under MPEP § 2304.04(a), 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.

Interfering Claim Already in Application

This section addresses Interfering Claim Already in Application. Primary authority: 37 CFR 41.202(a) and 37 CFR 41.203(a). Contains: 1 requirement, 4 guidance statements, and 3 permissions.

Key Rules

Topic

PTAB Jurisdiction

6 rules
StatutoryRecommendedAlways
[mpep-2304-04-a-691da9c87ec1eddb7cee0e5e]
Examiner Must Suggest Interference with IPS
Note:
The examiner must work with an Interference Practice Specialist to suggest an interference if the applicant does not do so, ensuring all claims define the same invention.

If the applicant does not suggest an interference, then the examiner should work with an Interference Practice Specialist (IPS) to suggest an interference to the Board. The suggestion should include an explanation of why at least one claim of every application or patent defines the same invention within the meaning of 37 CFR 41.203(a). See MPEP § 2301.03 for a discussion of interfering subject matter. The examiner must also complete Form PTO-850.

Jump to MPEP Source · 37 CFR 41.203(a)PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
StatutoryRecommendedAlways
[mpep-2304-04-a-4f1695964a9c528efd846f4e]
Examiner Must Suggest Interference for Same Invention
Note:
The examiner must suggest an interference if the applicant does not, explaining why at least one claim of every application or patent defines the same invention.

If the applicant does not suggest an interference, then the examiner should work with an Interference Practice Specialist (IPS) to suggest an interference to the Board. The suggestion should include an explanation of why at least one claim of every application or patent defines the same invention within the meaning of 37 CFR 41.203(a). See MPEP § 2301.03 for a discussion of interfering subject matter. The examiner must also complete Form PTO-850.

Jump to MPEP Source · 37 CFR 41.203(a)PTAB JurisdictionPTAB Contested Case ProceduresInterference Proceedings (Pre-AIA)
StatutoryRequiredAlways
[mpep-2304-04-a-667ac4679618db4833ef7dd9]
Examiner Must Complete Form PTO-850 When Suggesting Interference
Note:
The examiner is required to complete Form PTO-850 when suggesting an interference, especially if the applicant does not suggest one.

If the applicant does not suggest an interference, then the examiner should work with an Interference Practice Specialist (IPS) to suggest an interference to the Board. The suggestion should include an explanation of why at least one claim of every application or patent defines the same invention within the meaning of 37 CFR 41.203(a). See MPEP § 2301.03 for a discussion of interfering subject matter. The examiner must also complete Form PTO-850.

Jump to MPEP Source · 37 CFR 41.203(a)PTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
StatutoryRecommendedAlways
[mpep-2304-04-a-9073403b21149d263430c7e9]
Examiner Must Discuss Interference and Prior Art
Note:
The examiner must discuss why claims interfere, whether other claims would have been anticipated or rendered obvious if treated as prior art, and the entitlement to claim a constructive reduction-to-practice.

The examiner should be prepared to discuss why claims interfere, whether the subject matter of other claims would have been anticipated or rendered obvious if the interfering claims are treated as prior art, and whether an applicant or patentee is entitled to claim the benefit of an application as a constructive reduction-to-practice. The IPS may require the examiner to prepare a memorandum for the Board on any of these subjects. The IPS may require the examiner to participate in a conference with the Board to discuss the suggested interference.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresPriority and Benefit Claims
StatutoryPermittedAlways
[mpep-2304-04-a-775ae04636fd0482f5d212ce]
Examiner Must Prepare Memorandum on Interference Subjects
Note:
The examiner is required to prepare a memorandum for the Board discussing interference claims, anticipation, obviousness, and benefit of filing.

The examiner should be prepared to discuss why claims interfere, whether the subject matter of other claims would have been anticipated or rendered obvious if the interfering claims are treated as prior art, and whether an applicant or patentee is entitled to claim the benefit of an application as a constructive reduction-to-practice. The IPS may require the examiner to prepare a memorandum for the Board on any of these subjects. The IPS may require the examiner to participate in a conference with the Board to discuss the suggested interference.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
StatutoryPermittedAlways
[mpep-2304-04-a-b1c0a0d545f3e33c67a52769]
Examiner Must Participate in Board Conference on Interference
Note:
The examiner must participate in a conference with the Board to discuss suggested interference, including why claims interfere and other related matters.

The examiner should be prepared to discuss why claims interfere, whether the subject matter of other claims would have been anticipated or rendered obvious if the interfering claims are treated as prior art, and whether an applicant or patentee is entitled to claim the benefit of an application as a constructive reduction-to-practice. The IPS may require the examiner to prepare a memorandum for the Board on any of these subjects. The IPS may require the examiner to participate in a conference with the Board to discuss the suggested interference.

Jump to MPEP SourcePTAB JurisdictionPTAB Contested Case ProceduresEx Parte Appeals to PTAB
Topic

Declaration of Interference

2 rules
StatutoryPermittedAlways
[mpep-2304-04-a-eebf72e3d5705c5c0759c528]
Examiner May Invite Applicant to Propose Interference
Note:
The examiner may ask the applicant to suggest an interference, as per 37 CFR 41.202(a), allowing the applicant to present their views on how the interference should be declared.

The examiner may invite the applicant to suggest an interference pursuant to 37 CFR 41.202(a). An applicant may be motivated to do so in order to present its views on how the interference should be declared.

Jump to MPEP Source · 37 CFR 41.202(a)Declaration of InterferenceInterference Proceedings (Pre-AIA)
StatutoryRecommendedAlways
[mpep-2304-04-a-2ea45960ee629b5a3fe9226b]
Applicant May Suggest Interference
Note:
An applicant may propose how an interference should be declared to present their views.

The examiner may invite the applicant to suggest an interference pursuant to 37 CFR 41.202(a). An applicant may be motivated to do so in order to present its views on how the interference should be declared.

Jump to MPEP Source · 37 CFR 41.202(a)Declaration of InterferenceInterference Proceedings (Pre-AIA)

Citations

Primary topicCitation
Declaration of Interference37 CFR § 41.202(a)
PTAB Jurisdiction37 CFR § 41.203(a)
PTAB JurisdictionMPEP § 2301.03

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