MPEP § 2802 — Supplemental Examination (Annotated Rules)

§2802 Supplemental Examination

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

This page consolidates and annotates all enforceable requirements under MPEP § 2802, 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.

Supplemental Examination

This section addresses Supplemental Examination. Primary authority: 35 U.S.C. 257, 35 U.S.C. 257(a), and 35 U.S.C. 101. Contains: 7 requirements, 5 prohibitions, 1 permission, and 4 other statements.

Key Rules

Topic

Reexamination Order

11 rules
StatutoryProhibitedAlways
[mpep-2802-836c7a1d803b83d29aff7b63]
Patent Owner Lacks Section 304 Statement Right During Reexamination
Note:
The patent owner is not allowed to file a section 304 statement during the reexamination process, which follows procedures established by chapter 30.

(b) REEXAMINATION ORDERED.—If the certificate issued under subsection (a) indicates that a substantial new question of patentability is raised by 1 or more items of information in the request, the Director shall order reexamination of the patent. The reexamination shall be conducted according to procedures established by chapter 30, except that the patent owner shall not have the right to file a statement pursuant to section 304. During the reexamination, the Director shall address each substantial new question of patentability identified during the supplemental examination, notwithstanding the limitations in chapter 30 relating to patents and printed publication or any other provision of such chapter.

Jump to MPEP SourceReexamination OrderSupplemental ExaminationReexamination Certificate
StatutoryProhibitedAlways
[mpep-2802-22ba253864cc52bbadfb5371]
Supplemental Examination for Patent Enforceability
Note:
A patent is not unenforceable based on prior examination information that was later corrected during a supplemental examination.
(c) EFFECT.—
  • (1) IN GENERAL.—A patent shall not be held unenforceable on the basis of conduct relating to information that had not been considered, was inadequately considered, or was incorrect in a prior examination of the patent if the information was considered, reconsidered, or corrected during a supplemental examination of the patent. The making of a request under subsection (a), or the absence thereof, shall not be relevant to enforceability of the patent under section 282.
  • (2) EXCEPTIONS.—
    • (A) PRIOR ALLEGATIONS.—Paragraph (1) shall not apply to an allegation pled with particularity in a civil action, or set forth with particularity in a notice received by the patent owner under section 505(j)(2)(B)(iv)(II) of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 355(j)(2)(B)(iv)(II)), before the date of a supplemental examination request under subsection (a) to consider, reconsider, or correct information forming the basis for the allegation.
    • (B) PATENT ENFORCEMENT ACTIONS.—In an action brought under section 337(a) of the Tariff Act of 1930 (19 U.S.C. 1337(a)), or section 281 of this title, paragraph (1) shall not apply to any defense raised in the action that is based upon information that was considered, reconsidered, or corrected pursuant to a supplemental examination request under subsection (a), unless the supplemental examination, and any reexamination ordered pursuant to the request, are concluded before the date on which the action is brought.
Jump to MPEP SourceReexamination OrderStatutory Authority for ExaminationEx Parte Reexamination
StatutoryProhibitedAlways
[mpep-2802-fd208894669f4312592a24ce]
Supplemental Examination Requirement for Patent Enforcement Actions
Note:
A defense based on information from a supplemental examination is valid in patent enforcement actions if the examination and any reexamination are completed before the action is filed.

(c) EFFECT.—
(2) EXCEPTIONS.—

(B) PATENT ENFORCEMENT ACTIONS.—In an action brought under section 337(a) of the Tariff Act of 1930 (19 U.S.C. 1337(a)), or section 281 of this title, paragraph (1) shall not apply to any defense raised in the action that is based upon information that was considered, reconsidered, or corrected pursuant to a supplemental examination request under subsection (a), unless the supplemental examination, and any reexamination ordered pursuant to the request, are concluded before the date on which the action is brought.

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-67bf8af137068327c982fe8e]
Fees for Supplemental Examination Requests Must Be Established by Regulation
Note:
The Director must establish fees for supplemental examination requests and reexamination proceedings, as well as issue regulations governing the form and content of such requests.
(d) FEES AND REGULATIONS.—
  • (1) FEES.—The Director shall, by regulation, establish fees for the submission of a request for supplemental examination of a patent, and to consider each item of information submitted in the request. If reexamination is ordered under subsection (b), fees established and applicable to ex parte reexamination proceedings under chapter 30 shall be paid, in addition to fees applicable to supplemental examination.
  • (2) REGULATIONS.—The Director shall issue regulations governing the form, content, and other requirements of requests for supplemental examination, and establishing procedures for reviewing information submitted in such requests.
Jump to MPEP SourceReexamination OrderStatutory Authority for ExaminationEx Parte Reexamination
StatutoryRequiredAlways
[mpep-2802-9535e80390e0b29dc925d992]
Fees for Ordered Reexaminations
Note:
Paying additional fees for reexaminations ordered under subsection (b) beyond the supplemental examination fees.

(d) FEES AND REGULATIONS.— (1) FEES.—The Director shall, by regulation, establish fees for the submission of a request for supplemental examination of a patent, and to consider each item of information submitted in the request. If reexamination is ordered under subsection (b), fees established and applicable to ex parte reexamination proceedings under chapter 30 shall be paid, in addition to fees applicable to supplemental examination.

Jump to MPEP SourceReexamination OrderStatutory Authority for ExaminationEx Parte Reexamination
StatutoryProhibitedAlways
[mpep-2802-a5e193dc82fd6e1ec16e4c31]
Director Must Refer Potential Patent Fraud to Attorney General
Note:
If the Director discovers potential fraud during a supplemental examination, they must refer the case to the Attorney General for further action.

(e) FRAUD.—If the Director becomes aware, during the course of a supplemental examination or reexamination proceeding ordered under this section, that a material fraud on the Office may have been committed in connection with the patent that is the subject of the supplemental examination, then in addition to any other actions the Director is authorized to take, including the cancellation of any claims found to be invalid under section 307 as a result of a reexamination ordered under this section, the Director shall also refer the matter to the Attorney General for such further action as the Attorney General may deem appropriate. Any such referral shall be treated as confidential, shall not be included in the file of the patent, and shall not be disclosed to the public unless the United States charges a person with a criminal offense in connection with such referral.

Jump to MPEP SourceReexamination OrderEffect of Supplemental ExaminationEx Parte Reexamination
StatutoryInformativeAlways
[mpep-2802-19b84697ccd1a38da8843376]
Patent Owner Lacks Right to File Statement During Ex Parte Reexamination
Note:
During ex parte reexamination, the patent owner cannot file a statement under 35 U.S.C. 304, and the examination basis is broader than just patents and printed publications.

If the supplemental examination certificate, issued under 35 U.S.C. 257(a), indicates that a substantial new question of patentability is raised by one or more items of information in the request for supplemental examination, the supplemental examination certificate will indicate that ex parte reexamination will be ordered by the Office. The resulting ex parte reexamination proceeding will be conducted according to ex parte reexamination procedures, except that the patent owner does not have the right to file a statement pursuant to 35 U.S.C. 304, and the basis of the ex parte reexamination is not limited to patents and printed publications. Each substantial new question of patentability identified during the supplemental examination proceeding will be addressed by the Office during the resulting ex parte reexamination proceeding. See 35 U.S.C. 257(b).

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationReexamination Certificate
StatutoryInformativeAlways
[mpep-2802-32231c74b0766ef31680985d]
Director Can Set Fees For Supplemental Examinations And Reexaminations
Note:
The Director has the authority to establish fees for filing a request for supplemental examination and considering each item of information submitted, as well as additional fees for ex parte reexamination.

35 U.S.C. 257(d)(1) provides the Director with authority to establish fees for filing a request for supplemental examination and for considering each item of information submitted with the request. If ex parte reexamination is ordered under 35 U.S.C. 257(b), 35 U.S.C. 257(d)(1) also establishes that the fees applicable to ex parte reexamination must be paid in addition to the fees for supplemental examination. 35 U.S.C. 257(d)(2) provides the Director with authority to establish regulations governing the requirements of a request for supplemental examination, including its form and content.

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-8f483e7b03a9b6bbadad629b]
Fees for Ex Parte Reexamination Must Be Paid In Addition to Supplemental Examination Fees
Note:
If ex parte reexamination is ordered, the fees for it must be paid in addition to the fees for supplemental examination.

35 U.S.C. 257(d)(1) provides the Director with authority to establish fees for filing a request for supplemental examination and for considering each item of information submitted with the request. If ex parte reexamination is ordered under 35 U.S.C. 257(b), 35 U.S.C. 257(d)(1) also establishes that the fees applicable to ex parte reexamination must be paid in addition to the fees for supplemental examination. 35 U.S.C. 257(d)(2) provides the Director with authority to establish regulations governing the requirements of a request for supplemental examination, including its form and content.

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationSupplemental Examination
StatutoryInformativeAlways
[mpep-2802-ecc24c2eb42d5044f3cad9f2]
Director Can Set Supplemental Examination Requirements
Note:
The Director has the authority to establish regulations for the form and content of requests for supplemental examination.

35 U.S.C. 257(d)(1) provides the Director with authority to establish fees for filing a request for supplemental examination and for considering each item of information submitted with the request. If ex parte reexamination is ordered under 35 U.S.C. 257(b), 35 U.S.C. 257(d)(1) also establishes that the fees applicable to ex parte reexamination must be paid in addition to the fees for supplemental examination. 35 U.S.C. 257(d)(2) provides the Director with authority to establish regulations governing the requirements of a request for supplemental examination, including its form and content.

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-577baa970a9bcc92ed983cb5]
Office Must Refer Material Fraud to U.S. Attorney General During Supplemental Examinations
Note:
The Office must refer any material fraud discovered during a supplemental examination to the U.S. Attorney General, in addition to other authorized actions.

In accordance with 35 U.S.C. 257(e), if the Office becomes aware, during the course of a supplemental examination or ex parte reexamination ordered under 35 U.S.C. 257, that a material fraud on the Office may have been committed in connection with the patent that is the subject of the supplemental examination, the Office shall refer the matter to the U.S. Attorney General, in addition to any other actions the Office is authorized to take, including the cancellation of any claims found to be invalid under 35 U.S.C. 307 as a result of ex parte reexamination ordered under 35 U.S.C. 257. The Office anticipates that such instances will be rare. The Office regards the term "material fraud" in 35 U.S.C. 257(e) to be narrower in scope than inequitable conduct as defined by the U.S. Court of Appeals for the Federal Circuit in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 99 USPQ2d 1065 (Fed. Cir. 2011).

Jump to MPEP SourceReexamination OrderEffect of Supplemental ExaminationEx Parte Reexamination
Topic

Reexamination Certificate

5 rules
StatutoryRequiredAlways
[mpep-2802-2e620f20c8ae6a220a2d8f5b]
Director Must Issue Reexamination Certificate Within 3 Months
Note:
The Director must conduct a supplemental examination within 3 months of receiving a request and issue a certificate indicating whether the presented information raises a substantial new question of patentability.

(a) REQUEST FOR SUPPLEMENTAL EXAMINATION.—A patent owner may request supplemental examination of a patent in the Office to consider, reconsider, or correct information believed to be relevant to the patent, in accordance with such requirements as the Director may establish. Within 3 months after the date a request for supplemental examination meeting the requirements of this section is received, the Director shall conduct the supplemental examination and shall conclude such examination by issuing a certificate indicating whether the information presented in the request raises a substantial new question of patentability.

Jump to MPEP SourceReexamination CertificateSNQ CriteriaDetermination on Request
StatutoryRequiredAlways
[mpep-2802-c4360c67f30e25ed300a3e60]
Substantial New Question of Patentability Requires Reexamination
Note:
If the certificate indicates a substantial new question, the Director must order reexamination of the patent.

(b) REEXAMINATION ORDERED.—If the certificate issued under subsection (a) indicates that a substantial new question of patentability is raised by 1 or more items of information in the request, the Director shall order reexamination of the patent. The reexamination shall be conducted according to procedures established by chapter 30, except that the patent owner shall not have the right to file a statement pursuant to section 304. During the reexamination, the Director shall address each substantial new question of patentability identified during the supplemental examination, notwithstanding the limitations in chapter 30 relating to patents and printed publication or any other provision of such chapter.

Jump to MPEP SourceReexamination CertificateSNQ CriteriaConclusion of Ex Parte Reexamination
StatutoryRequiredAlways
[mpep-2802-696d0cb0d0f22b978d15008e]
Supplemental Examination Within Three Months
Note:
The Office must conduct a supplemental examination within three months of receiving a request that meets the requirements of 35 U.S.C. 257 and issue a certificate indicating any new questions of patentability.

35 U.S.C. 257(a) provides that supplemental examination may be requested by the patent owner to consider, reconsider, or correct information believed to be relevant to the patent in accordance with requirements established by the Office. The information presented in a request for supplemental examination is not limited to patents and printed publications, and may include, for example, issues of patentability under 35 U.S.C. 101 and 112. Within three months of the receipt of a request for supplemental examination (meeting the requirements of 35 U.S.C. 257 including the requirements established by the Office), the Office shall conduct a supplemental examination and conclude the supplemental examination proceeding with the issuance of a supplemental examination certificate. The supplemental examination certificate shall indicate whether the items of information presented in the request raise a substantial new question of patentability.

Jump to MPEP SourceReexamination CertificateConclusion of Ex Parte ReexaminationSupplemental Examination Certificate
StatutoryRequiredAlways
[mpep-2802-4316cc59c56d4fb6edd5a1e6]
Supplemental Exam Cert Must Indicate New Question of Patentability
Note:
The supplemental examination certificate must indicate whether the presented information raises a new question regarding patentability.

35 U.S.C. 257(a) provides that supplemental examination may be requested by the patent owner to consider, reconsider, or correct information believed to be relevant to the patent in accordance with requirements established by the Office. The information presented in a request for supplemental examination is not limited to patents and printed publications, and may include, for example, issues of patentability under 35 U.S.C. 101 and 112. Within three months of the receipt of a request for supplemental examination (meeting the requirements of 35 U.S.C. 257 including the requirements established by the Office), the Office shall conduct a supplemental examination and conclude the supplemental examination proceeding with the issuance of a supplemental examination certificate. The supplemental examination certificate shall indicate whether the items of information presented in the request raise a substantial new question of patentability.

Jump to MPEP SourceReexamination CertificateSNQ CriteriaConclusion of Ex Parte Reexamination
StatutoryInformativeAlways
[mpep-2802-71806ea472946b3f2a6970f6]
Supplemental Examination Certificate Indicates New Question of Patentability Requires Reexamination
Note:
If a supplemental examination certificate indicates a new question of patentability, ex parte reexamination will be ordered by the Office.

If the supplemental examination certificate, issued under 35 U.S.C. 257(a), indicates that a substantial new question of patentability is raised by one or more items of information in the request for supplemental examination, the supplemental examination certificate will indicate that ex parte reexamination will be ordered by the Office. The resulting ex parte reexamination proceeding will be conducted according to ex parte reexamination procedures, except that the patent owner does not have the right to file a statement pursuant to 35 U.S.C. 304, and the basis of the ex parte reexamination is not limited to patents and printed publications. Each substantial new question of patentability identified during the supplemental examination proceeding will be addressed by the Office during the resulting ex parte reexamination proceeding. See 35 U.S.C. 257(b).

Jump to MPEP SourceReexamination CertificateSNQ CriteriaConclusion of Ex Parte Reexamination
Topic

Supplemental Examination

5 rules
StatutoryProhibitedAlways
[mpep-2802-cce8a2f7aa680c7789e1ca28]
Prior Allegations Not Subject to Supplemental Examination
Note:
This rule states that allegations previously pled with particularity in a civil action or set forth in a notice before a supplemental examination request cannot be subject to reconsideration under the supplemental examination process.

(c) EFFECT.—
(2) EXCEPTIONS.— (A) PRIOR ALLEGATIONS.—Paragraph (1) shall not apply to an allegation pled with particularity in a civil action, or set forth with particularity in a notice received by the patent owner under section 505(j)(2)(B)(iv)(II) of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 355(j)(2)(B)(iv)(II)), before the date of a supplemental examination request under subsection (a) to consider, reconsider, or correct information forming the basis for the allegation.

Jump to MPEP SourceSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-b74c47d8e2d0e2f3679e7efc]
Regulations for Supplemental Examination Requests
Note:
The Director must create rules for the form, content, and procedures of supplemental examination requests.

(d) FEES AND REGULATIONS.—

(2) REGULATIONS.—The Director shall issue regulations governing the form, content, and other requirements of requests for supplemental examination, and establishing procedures for reviewing information submitted in such requests.

Jump to MPEP SourceSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-c61564104e34a62ea7edf35f]
Sanctions Not Limited by Section
Note:
This rule states that the section does not restrict the imposition of sanctions based on criminal laws, antitrust regulations, or the Director's authority to investigate and sanction misconduct.
(f) RULE OF CONSTRUCTION.—Nothing in this section shall be construed—
  • (1) to preclude the imposition of sanctions based upon criminal or antitrust laws (including section 1001(a) of title 18, the first section of the Clayton Act, and section 5 of the Federal Trade Commission Act to the extent that section relates to unfair methods of competition);
  • (2) to limit the authority of the Director to investigate issues of possible misconduct and impose sanctions for misconduct in connection with matters or proceedings before the Office; or
  • (3) to limit the authority of the Director to issue regulations under chapter 3 relating to sanctions for misconduct by representatives practicing before the Office.
Jump to MPEP SourceSupplemental Examination
StatutoryPermittedAlways
[mpep-2802-499a63656d7ec0615fc340d3]
Patent Owner Can Request Supplemental Examination
Note:
The patent owner may request a supplemental examination to consider, reconsider, or correct information relevant to the patent within three months of submission.

35 U.S.C. 257(a) provides that supplemental examination may be requested by the patent owner to consider, reconsider, or correct information believed to be relevant to the patent in accordance with requirements established by the Office. The information presented in a request for supplemental examination is not limited to patents and printed publications, and may include, for example, issues of patentability under 35 U.S.C. 101 and 112. Within three months of the receipt of a request for supplemental examination (meeting the requirements of 35 U.S.C. 257 including the requirements established by the Office), the Office shall conduct a supplemental examination and conclude the supplemental examination proceeding with the issuance of a supplemental examination certificate. The supplemental examination certificate shall indicate whether the items of information presented in the request raise a substantial new question of patentability.

Jump to MPEP SourceSupplemental ExaminationReexamination CertificateSNQ Criteria
StatutoryInformativeAlways
[mpep-2802-74612b965ee5be70d6780a23]
Sanctions Can Be Imposed for Misconduct
Note:
This rule allows the imposition of sanctions based on criminal, antitrust laws, and unfair competition methods under certain patent proceedings.

Nothing in 35 U.S.C. 257 precludes the imposition of sanctions based upon criminal or antitrust laws (including 18 U.S.C. 1001(a)), the first section of the Clayton Act, and section 5 of the Federal Trade Commission Act to the extent that section relates to unfair methods of competition. See 35 U.S.C. 257(f)(1). Section 12 of the AIA sets forth rules of construction, providing that 35 U.S.C. 257 shall not be construed to limit the authority of the Office to investigate issues of possible misconduct and impose sanctions for misconduct involving matters or proceedings before the Office, or to issue regulations under 35 U.S.C. 32 or 35 U.S.C. 33 relating to sanctions for misconduct by patent practitioners. See 35 U.S.C. 257(f)(2) and 35 U.S.C. 257(f)(3).

Jump to MPEP SourceSupplemental ExaminationAIA vs Pre-AIA Practice
Topic

Statutory Authority for Examination

4 rules
StatutoryPermittedAlways
[mpep-2802-83d862920bb0eedcc48119a8]
Patent Owner May Request Supplemental Examination to Consider Relevant Information
Note:
A patent owner can request the Office to conduct a supplemental examination of their patent, considering or correcting relevant information within three months.

(a) REQUEST FOR SUPPLEMENTAL EXAMINATION.—A patent owner may request supplemental examination of a patent in the Office to consider, reconsider, or correct information believed to be relevant to the patent, in accordance with such requirements as the Director may establish. Within 3 months after the date a request for supplemental examination meeting the requirements of this section is received, the Director shall conduct the supplemental examination and shall conclude such examination by issuing a certificate indicating whether the information presented in the request raises a substantial new question of patentability.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresSupplemental Examination
StatutoryProhibitedAlways
[mpep-2802-519a965c53857f95851ec97b]
Patent Not Unenforceable Due to Prior Exam Conduct
Note:
A patent will not be deemed unenforceable based on actions taken in a prior examination if the information is later considered, reconsidered, or corrected during a supplemental examination.

(c) EFFECT.— (1) IN GENERAL.—A patent shall not be held unenforceable on the basis of conduct relating to information that had not been considered, was inadequately considered, or was incorrect in a prior examination of the patent if the information was considered, reconsidered, or corrected during a supplemental examination of the patent. The making of a request under subsection (a), or the absence thereof, shall not be relevant to enforceability of the patent under section 282.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresSupplemental Examination
StatutoryProhibitedAlways
[mpep-2802-d990bd90656a1fc52fd34216]
Request Irrelevant to Patent Enforceability
Note:
The making of a request for supplemental examination, whether present or absent, does not affect the enforceability of a patent under section 282.

(c) EFFECT.— (1) IN GENERAL.—A patent shall not be held unenforceable on the basis of conduct relating to information that had not been considered, was inadequately considered, or was incorrect in a prior examination of the patent if the information was considered, reconsidered, or corrected during a supplemental examination of the patent. The making of a request under subsection (a), or the absence thereof, shall not be relevant to enforceability of the patent under section 282.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresSupplemental Examination
StatutoryRequiredAlways
[mpep-2802-3806aeb2fdd2f78b25554766]
Fees for Supplemental Examination Requests
Note:
The Director must establish fees for submitting requests for supplemental examination and considering information submitted in such requests.

(d) FEES AND REGULATIONS.— (1) FEES.—The Director shall, by regulation, establish fees for the submission of a request for supplemental examination of a patent, and to consider each item of information submitted in the request. If reexamination is ordered under subsection (b), fees established and applicable to ex parte reexamination proceedings under chapter 30 shall be paid, in addition to fees applicable to supplemental examination.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresReexamination Order
Topic

SNQ Criteria

2 rules
StatutoryRequiredAlways
[mpep-2802-84a66579176970076c3ed713]
Director Must Address Substantial New Questions During Reexamination
Note:
The Director is required to address each substantial new question of patentability identified during the supplemental examination, regardless of any limitations in chapter 30.

(b) REEXAMINATION ORDERED.—If the certificate issued under subsection (a) indicates that a substantial new question of patentability is raised by 1 or more items of information in the request, the Director shall order reexamination of the patent. The reexamination shall be conducted according to procedures established by chapter 30, except that the patent owner shall not have the right to file a statement pursuant to section 304. During the reexamination, the Director shall address each substantial new question of patentability identified during the supplemental examination, notwithstanding the limitations in chapter 30 relating to patents and printed publication or any other provision of such chapter.

Jump to MPEP SourceSNQ CriteriaSubstantial New Question of PatentabilityEx Parte Reexamination
StatutoryInformativeAlways
[mpep-2802-d9df08353ffa88d1e062a636]
Substantial New Question of Patentability During Supplemental Examination Requires Ex Parte Reexamination
Note:
If a substantial new question of patentability is identified during the supplemental examination, it must be addressed in the resulting ex parte reexamination proceeding.

If the supplemental examination certificate, issued under 35 U.S.C. 257(a), indicates that a substantial new question of patentability is raised by one or more items of information in the request for supplemental examination, the supplemental examination certificate will indicate that ex parte reexamination will be ordered by the Office. The resulting ex parte reexamination proceeding will be conducted according to ex parte reexamination procedures, except that the patent owner does not have the right to file a statement pursuant to 35 U.S.C. 304, and the basis of the ex parte reexamination is not limited to patents and printed publications. Each substantial new question of patentability identified during the supplemental examination proceeding will be addressed by the Office during the resulting ex parte reexamination proceeding. See 35 U.S.C. 257(b).

Jump to MPEP SourceSNQ CriteriaSubstantial New Question of PatentabilityEx Parte Reexamination
Topic

Substantial New Question of Patentability

1 rules
StatutoryPermittedAlways
[mpep-2802-83eff280e8f9b8c3cbd51832]
Information for Supplemental Exam Not Limited to Patents and Printed Publications
Note:
The information presented in a request for supplemental examination can include issues of patentability under 35 U.S.C. 101 and 112, not limited to patents and printed publications.

35 U.S.C. 257(a) provides that supplemental examination may be requested by the patent owner to consider, reconsider, or correct information believed to be relevant to the patent in accordance with requirements established by the Office. The information presented in a request for supplemental examination is not limited to patents and printed publications, and may include, for example, issues of patentability under 35 U.S.C. 101 and 112. Within three months of the receipt of a request for supplemental examination (meeting the requirements of 35 U.S.C. 257 including the requirements established by the Office), the Office shall conduct a supplemental examination and conclude the supplemental examination proceeding with the issuance of a supplemental examination certificate. The supplemental examination certificate shall indicate whether the items of information presented in the request raise a substantial new question of patentability.

Jump to MPEP SourceSubstantial New Question of PatentabilitySupplemental ExaminationReexamination Certificate
Topic

Ex Parte Reexamination

1 rules
StatutoryInformativeAlways
[mpep-2802-bd326dea2b45f05af1609ba6]
Effect of Supplemental and Reexamination on Patent Enforceability
Note:
This rule specifies how a supplemental examination and any resulting ex parte reexamination affect the enforceability of a patent.

35 U.S.C. 257(c) specifies the effect of a supplemental examination under 35 U.S.C. 257(a) and any resulting ex parte reexamination under 35 U.S.C. 257(b) on the enforceability of the patent.

Jump to MPEP SourceEx Parte ReexaminationSupplemental Examination
Topic

Effect of Supplemental Examination

1 rules
StatutoryInformativeAlways
[mpep-2802-81edaa422697ca780f1992e5]
Material Fraud Is Narrower Than Inequitable Conduct
Note:
The Office defines 'material fraud' under 35 U.S.C. 257(e) as a more limited form of misconduct compared to the broader definition provided by Therasense, Inc.

In accordance with 35 U.S.C. 257(e), if the Office becomes aware, during the course of a supplemental examination or ex parte reexamination ordered under 35 U.S.C. 257, that a material fraud on the Office may have been committed in connection with the patent that is the subject of the supplemental examination, the Office shall refer the matter to the U.S. Attorney General, in addition to any other actions the Office is authorized to take, including the cancellation of any claims found to be invalid under 35 U.S.C. 307 as a result of ex parte reexamination ordered under 35 U.S.C. 257. The Office anticipates that such instances will be rare. The Office regards the term "material fraud" in 35 U.S.C. 257(e) to be narrower in scope than inequitable conduct as defined by the U.S. Court of Appeals for the Federal Circuit in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 99 USPQ2d 1065 (Fed. Cir. 2011).

Jump to MPEP SourceEffect of Supplemental ExaminationSupplemental ExaminationReexamination Order
Topic

AIA vs Pre-AIA Practice

1 rules
StatutoryProhibitedAlways
[mpep-2802-2c4335edb2420e68f33151f2]
Office Has Sanctioning Power for Misconduct
Note:
The Office can investigate and impose sanctions for misconduct related to patent proceedings, regardless of 35 U.S.C. 257 limitations.

Nothing in 35 U.S.C. 257 precludes the imposition of sanctions based upon criminal or antitrust laws (including 18 U.S.C. 1001(a)), the first section of the Clayton Act, and section 5 of the Federal Trade Commission Act to the extent that section relates to unfair methods of competition. See 35 U.S.C. 257(f)(1). Section 12 of the AIA sets forth rules of construction, providing that 35 U.S.C. 257 shall not be construed to limit the authority of the Office to investigate issues of possible misconduct and impose sanctions for misconduct involving matters or proceedings before the Office, or to issue regulations under 35 U.S.C. 32 or 35 U.S.C. 33 relating to sanctions for misconduct by patent practitioners. See 35 U.S.C. 257(f)(2) and 35 U.S.C. 257(f)(3).

Jump to MPEP SourceAIA vs Pre-AIA PracticeSupplemental Examination

Citations

Primary topicCitation
Reexamination Certificate
Substantial New Question of Patentability
Supplemental Examination
35 U.S.C. § 101
AIA vs Pre-AIA Practice
Effect of Supplemental Examination
Reexamination Certificate
Reexamination Order
Substantial New Question of Patentability
Supplemental Examination
35 U.S.C. § 257
Ex Parte Reexamination
Reexamination Certificate
Reexamination Order
SNQ Criteria
Substantial New Question of Patentability
Supplemental Examination
35 U.S.C. § 257(a)
Ex Parte Reexamination
Reexamination Certificate
Reexamination Order
SNQ Criteria
35 U.S.C. § 257(b)
Ex Parte Reexamination35 U.S.C. § 257(c)
Reexamination Order35 U.S.C. § 257(d)(1)
Reexamination Order35 U.S.C. § 257(d)(2)
Effect of Supplemental Examination
Reexamination Order
35 U.S.C. § 257(e)
AIA vs Pre-AIA Practice
Supplemental Examination
35 U.S.C. § 257(f)(1)
AIA vs Pre-AIA Practice
Supplemental Examination
35 U.S.C. § 257(f)(2)
AIA vs Pre-AIA Practice
Supplemental Examination
35 U.S.C. § 257(f)(3)
Reexamination Certificate
Reexamination Order
SNQ Criteria
35 U.S.C. § 304
Effect of Supplemental Examination
Reexamination Order
35 U.S.C. § 307
AIA vs Pre-AIA Practice
Supplemental Examination
35 U.S.C. § 32
AIA vs Pre-AIA Practice
Supplemental Examination
35 U.S.C. § 33

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