MPEP § 1901.01 — Who Can Protest (Annotated Rules)

§1901.01 Who Can Protest

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

This page consolidates and annotates all enforceable requirements under MPEP § 1901.01, 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.

Who Can Protest

This section addresses Who Can Protest. Primary authority: 37 CFR 1.291, 37 CFR 1.291(b)(2), and 37 CFR 1.291(c)(5). Contains: 1 requirement, 2 prohibitions, 1 guidance statement, 2 permissions, and 3 other statements.

Key Rules

Topic

PTAB Contested Case Procedures

6 rules
StatutoryPermittedAlways
[mpep-1901-01-be72ca2ce6d67210e2bb652d]
Attorney Can File Protest on Behalf of Unnamed Party
Note:
An attorney or representative can file a protest on behalf of an unnamed real party in interest without identifying the party.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Practice
StatutoryInformativeAlways
[mpep-1901-01-a173da9909acfcb281220886]
Real Party in Interest Not Required to Be Identified
Note:
37 CFR 1.291 allows protests to be filed without identifying the real party in interest, as long as a statement is included that it's the first protest by that party.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Filing Requirements
StatutoryRequiredAlways
[mpep-1901-01-72640fd77868aea6ae715960]
First Protest Requirement
Note:
A statement must accompany the protest confirming it is the first protest by the real party in interest.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Filing Requirements
StatutoryInformativeAlways
[mpep-1901-01-7123d4cbad73a5a0efac82b8]
First Protest Requirement
Note:
A protest must be the first by the real party in interest and comply with specific requirements if not.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Filing Requirements
StatutoryProhibitedAlways
[mpep-1901-01-537dadd09af9341b92b3bc5e]
Multiple Protests by Same Party Not Allowed
Note:
A real party in interest cannot submit multiple protests through different representatives without complying with specific requirements.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Filing Requirements
StatutoryRecommendedAlways
[mpep-1901-01-72fdae8c8ac44a8ea1997cd1]
First Protest Not Compliant Is Considered
Note:
If a protest fails to state it is the first by the real party in interest and does not comply with specific requirements, but is indeed the first, it will still be considered.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB Contested Case ProceduresPTAB JurisdictionProtest Filing Requirements
Topic

PTAB Jurisdiction

3 rules
StatutoryPermittedAlways
[mpep-1901-01-bb7ef121c1905b6a15103e1b]
Public Can File Protest
Note:
Any individual, corporation, or government agency can file a protest under 37 CFR 1.291.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB JurisdictionPTAB Contested Case ProceduresThird Party Access to Files (MPEP 103, 1134.01)
StatutoryInformativeAlways
[mpep-1901-01-0681a3f7d32b7ec163977d85]
First Protest Not Subject to First Protest Requirement
Note:
A first protest in an application does not need to include a statement that it is the first protest by the real party in interest.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB JurisdictionPTAB Contested Case ProceduresProtest Filing Requirements
StatutoryProhibitedAlways
[mpep-1901-01-7b01836641dbb3cb408f4b7c]
Protestor Cannot Check for Existing Protests
Note:
A protestor may not know if a protest has already been filed and cannot check, especially in non-reissue applications.

Any member of the public, including private persons, corporate entities, and government agencies, may file a protest under 37 CFR 1.291. A protest may be filed by an attorney or other representative on behalf of an unnamed real party in interest. 37 CFR 1.291 does not require that the real party in interest be identified. In accordance with 37 CFR 1.291(b)(2), a statement must accompany the protest that it is the first protest submitted in the application by the real party in interest who is submitting the protest. Where a protest is not the first protest by the real party in interest, 37 CFR 1.291(b)(2) requires compliance with 37 CFR 1.291(c)(5). The requirements of 37 CFR 1.291(c)(5) cannot be avoided by multiple protests submitted by different people representing the same real party in interest. 37 CFR 1.291(b)(2) does not apply to the first protest in an application. A protestor may not know if a protest has already been filed (by another), and may have no way of checking (e.g., a non-reissue application for which the file wrapper is not publicly available). Should the protest (inadvertently or otherwise) fail to include the statement that the protest is the first protest by the real party in interest filing the current protest and fail to comply with 37 CFR 1.291(c)(5), if, in fact, the protest is the first filed protest in an application, it will be considered where all other conditions are met.

Jump to MPEP Source · 37 CFR 1.291PTAB JurisdictionPTAB Contested Case ProceduresReissue Application Filing

Citations

Primary topicCitation
PTAB Contested Case Procedures
PTAB Jurisdiction
37 CFR § 1.291
PTAB Contested Case Procedures
PTAB Jurisdiction
37 CFR § 1.291(b)(2)
PTAB Contested Case Procedures
PTAB Jurisdiction
37 CFR § 1.291(c)(5)

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