MPEP § 2821 — Multiple Post-Patent Office Proceedings (Annotated Rules)

§2821 Multiple Post-Patent Office Proceedings

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

This page consolidates and annotates all enforceable requirements under MPEP § 2821, 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.

Multiple Post-Patent Office Proceedings

This section addresses Multiple Post-Patent Office Proceedings. Primary authority: 35 U.S.C. 257, 35 U.S.C. 257(a), and 35 U.S.C. 257(b). Contains: 5 requirements, 2 permissions, and 7 other statements.

Key Rules

Topic

Reexamination Order

5 rules
StatutoryRequiredAlways
[mpep-2821-c258e77cee0360da7afbf609]
Reexamination Required If Ordered
Note:
The Office must conduct reexamination if ordered, following the procedures established by chapter 30.

If the patent owner files a request for supplemental examination that is in compliance with 35 U.S.C. 257 and all applicable rules, the Office is required under 35 U.S.C. 257(a) to conduct the examination and conclude the proceeding within three months from the filing date of the request. Any reexamination proceeding resulting from the supplemental examination proceeding must, in accordance with 35 U.S.C. 257(b), be conducted "according to the procedures established by chapter 30," which govern ex parte reexamination. If reexamination is ordered, the Office is required to proceed with the reexamination. 35 U.S.C. 304 requires the Office to resolve any substantial new question of patentability determined to be raised:

Jump to MPEP SourceReexamination OrderSNQ CriteriaSubstantial New Question of Patentability
StatutoryRequiredAlways
[mpep-2821-2f955ffced1430a5d937b57a]
Reexamination Ordered Must Be Conducted
Note:
Once reexamination is ordered, the Office must conduct it promptly as required by statute.

In addition, 35 U.S.C. 305 expressly provides that, after the order (and after the time period set for filing a patent owner statement under 35 U.S.C. 304, which is excluded by 35 U.S.C. 257(b)), "reexamination will be conducted." Therefore, once reexamination is ordered, the Office is required by statute to conduct the reexamination. Further, 35 U.S.C. 305 requires that an ex parte reexamination proceeding "be conducted with special dispatch within the Office." See also, Ethicon v. Quigg, 849 F.2d 1422, 7 USPQ2d 1152 (Fed. Cir. 1988). The Office, however, reserves its option, pursuant to 35 U.S.C. 315(d) or 35 U.S.C. 325(d), to determine the manner in which a reexamination proceeding ordered under 35 U.S.C. 257 may proceed, including providing for stay, transfer, consolidation or termination, when there is a copending inter partes review, post grant review, or covered business method review. The patent owner may wish to consider the provisions of 35 U.S.C. 257(c)(1) and 35 U.S.C. 257(c)(2) on the effectiveness of any supplemental examination on already pending litigation when determining whether and when to file a request for supplemental examination.

Jump to MPEP SourceReexamination OrderPatent Owner StatementEx Parte Reexamination
StatutoryPermittedAlways
[mpep-2821-0aa07cede4c2ac8cff70cbbd]
Office May Determine Reexamination Proceeding Manner When Inter Partes Review Is Copending
Note:
The Office can decide to stay, transfer, consolidate or terminate a reexamination proceeding when an inter partes review is pending.

In addition, 35 U.S.C. 305 expressly provides that, after the order (and after the time period set for filing a patent owner statement under 35 U.S.C. 304, which is excluded by 35 U.S.C. 257(b)), "reexamination will be conducted." Therefore, once reexamination is ordered, the Office is required by statute to conduct the reexamination. Further, 35 U.S.C. 305 requires that an ex parte reexamination proceeding "be conducted with special dispatch within the Office." See also, Ethicon v. Quigg, 849 F.2d 1422, 7 USPQ2d 1152 (Fed. Cir. 1988). The Office, however, reserves its option, pursuant to 35 U.S.C. 315(d) or 35 U.S.C. 325(d), to determine the manner in which a reexamination proceeding ordered under 35 U.S.C. 257 may proceed, including providing for stay, transfer, consolidation or termination, when there is a copending inter partes review, post grant review, or covered business method review. The patent owner may wish to consider the provisions of 35 U.S.C. 257(c)(1) and 35 U.S.C. 257(c)(2) on the effectiveness of any supplemental examination on already pending litigation when determining whether and when to file a request for supplemental examination.

Jump to MPEP SourceReexamination OrderEx Parte ReexaminationPatent Owner Statement
StatutoryPermittedAlways
[mpep-2821-f527e55e89052e7eff5dc7af]
Consider Supplemental Examination During Pending Litigation
Note:
Patent owners should assess the impact of supplemental examination on ongoing litigation when deciding whether and when to file such a request.

In addition, 35 U.S.C. 305 expressly provides that, after the order (and after the time period set for filing a patent owner statement under 35 U.S.C. 304, which is excluded by 35 U.S.C. 257(b)), "reexamination will be conducted." Therefore, once reexamination is ordered, the Office is required by statute to conduct the reexamination. Further, 35 U.S.C. 305 requires that an ex parte reexamination proceeding "be conducted with special dispatch within the Office." See also, Ethicon v. Quigg, 849 F.2d 1422, 7 USPQ2d 1152 (Fed. Cir. 1988). The Office, however, reserves its option, pursuant to 35 U.S.C. 315(d) or 35 U.S.C. 325(d), to determine the manner in which a reexamination proceeding ordered under 35 U.S.C. 257 may proceed, including providing for stay, transfer, consolidation or termination, when there is a copending inter partes review, post grant review, or covered business method review. The patent owner may wish to consider the provisions of 35 U.S.C. 257(c)(1) and 35 U.S.C. 257(c)(2) on the effectiveness of any supplemental examination on already pending litigation when determining whether and when to file a request for supplemental examination.

Jump to MPEP SourceReexamination OrderPatent Owner StatementEx Parte Reexamination
MPEP GuidanceInformativeAlways
[mpep-2821-a999e54b7ff339f5266f1de6]
Office May Merge Reexaminations Resulting from Supplemental Exams
Note:
The Office has the discretion to merge reexamination proceedings initiated as a result of supplemental examination proceedings when circumstances warrant.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceReexamination OrderMerged Reexamination ProceedingsAnticipation/Novelty
Topic

Merged Reexamination Proceedings

5 rules
MPEP GuidanceRequiredAlways
[mpep-2821-696aae2c56820433b66ba4ba]
Supplemental Examination Proceeding Must Conclude Within Three Months
Note:
A supplemental examination proceeding must be completed within three months from the filing date of the request.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceMerged Reexamination ProceedingsReexamination OrderAnticipation/Novelty
MPEP GuidanceInformativeAlways
[mpep-2821-40784371a4374bd5104b96e0]
Office Will Not Merge Supplemental Examination Proceedings
Note:
The Office generally will not combine multiple supplemental examination proceedings, but may merge them under specific circumstances.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceMerged Reexamination ProceedingsReexamination OrderAnticipation/Novelty
MPEP GuidanceInformativeAlways
[mpep-2821-93e04360a56e230fde4c4487]
Office Can Merge Supplemental Examination Proceedings As Needed
Note:
The Office may combine multiple supplemental examination proceedings when circumstances warrant, without requiring a petition from the applicant.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceMerged Reexamination ProceedingsReexamination OrderAnticipation/Novelty
MPEP GuidanceInformativeAlways
[mpep-2821-7c005131764c7551135ad21e]
Supplemental Examination and Ex Parte Reexamination Not Merged with Other Office Proceedings
Note:
The Office will not merge a supplemental examination proceeding or an ex parte reexamination proceeding resulting from it with any other type of Office proceeding.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceMerged Reexamination ProceedingsAnticipation/NoveltyEx Parte Reexamination
MPEP GuidanceInformativeAlways
[mpep-2821-7d99755b9a56870c6fba684e]
Office May Merge Supplemental Examination Proceedings Sua Sponte
Note:
The Office has the discretion to merge supplemental examination proceedings without filing a petition, based on circumstances.

A supplemental examination proceeding must conclude within three months from the filing date of the request. As a general rule, the Office will not merge a supplemental examination proceeding with any other supplemental examination proceeding. The Office, however, reserves its option to merge/consolidate supplemental examination proceedings as circumstances arise. The Office, likewise, does not anticipate that a supplemental examination proceeding or ex parte reexamination proceeding resulting from a supplemental examination proceeding will be merged with any other type of Office proceeding. The Office similarly reserves its option to merge reexamination proceedings that are ordered as a result of supplemental examination proceedings as circumstances arise. In such circumstances, filing a petition to merge is not necessary, since the Office will generally make a decision sua sponte whether to merge.

Jump to MPEP SourceMerged Reexamination ProceedingsReexamination OrderAnticipation/Novelty
Topic

Ex Parte Reexamination

3 rules
StatutoryRequiredAlways
[mpep-2821-d999025c356e426c80d79473]
Ex Parte Reexamination Must Follow Chapter 30 Procedures
Note:
Any reexamination proceeding initiated from a supplemental examination must follow the procedures established by chapter 30, which govern ex parte reexamination.

If the patent owner files a request for supplemental examination that is in compliance with 35 U.S.C. 257 and all applicable rules, the Office is required under 35 U.S.C. 257(a) to conduct the examination and conclude the proceeding within three months from the filing date of the request. Any reexamination proceeding resulting from the supplemental examination proceeding must, in accordance with 35 U.S.C. 257(b), be conducted "according to the procedures established by chapter 30," which govern ex parte reexamination. If reexamination is ordered, the Office is required to proceed with the reexamination. 35 U.S.C. 304 requires the Office to resolve any substantial new question of patentability determined to be raised:

Jump to MPEP SourceEx Parte ReexaminationSNQ CriteriaReexamination Order
StatutoryInformativeAlways
[mpep-2821-0cfec4b87257da075a33998e]
Ex Parte Reexamination Must Be Conducted with Special Dispatch
Note:
The Office is required to conduct ex parte reexamination proceedings promptly, as per 35 U.S.C. 305.

In addition, 35 U.S.C. 305 expressly provides that, after the order (and after the time period set for filing a patent owner statement under 35 U.S.C. 304, which is excluded by 35 U.S.C. 257(b)), "reexamination will be conducted." Therefore, once reexamination is ordered, the Office is required by statute to conduct the reexamination. Further, 35 U.S.C. 305 requires that an ex parte reexamination proceeding "be conducted with special dispatch within the Office." See also, Ethicon v. Quigg, 849 F.2d 1422, 7 USPQ2d 1152 (Fed. Cir. 1988). The Office, however, reserves its option, pursuant to 35 U.S.C. 315(d) or 35 U.S.C. 325(d), to determine the manner in which a reexamination proceeding ordered under 35 U.S.C. 257 may proceed, including providing for stay, transfer, consolidation or termination, when there is a copending inter partes review, post grant review, or covered business method review. The patent owner may wish to consider the provisions of 35 U.S.C. 257(c)(1) and 35 U.S.C. 257(c)(2) on the effectiveness of any supplemental examination on already pending litigation when determining whether and when to file a request for supplemental examination.

Jump to MPEP SourceEx Parte ReexaminationReexamination OrderPatent Owner Statement
StatutoryInformativeAlways
[mpep-2821-1096f7b46186f3a79aa766bf]
Mergers Involving Ex Parte Reexamination
Note:
This rule provides information on mergers involving ex parte reexamination proceedings.

See MPEP § 2283 for information on mergers involving an ex parte reexamination proceeding.

Jump to MPEP SourceEx Parte Reexamination
Topic

SNQ Criteria

2 rules
StatutoryRequiredAlways
[mpep-2821-de7ad8a11f99fd98640dadca]
Supplemental Examination Requirement Within Three Months
Note:
The patent office must conduct a supplemental examination and conclude the proceeding within three months of receiving a compliant request.

If the patent owner files a request for supplemental examination that is in compliance with 35 U.S.C. 257 and all applicable rules, the Office is required under 35 U.S.C. 257(a) to conduct the examination and conclude the proceeding within three months from the filing date of the request. Any reexamination proceeding resulting from the supplemental examination proceeding must, in accordance with 35 U.S.C. 257(b), be conducted "according to the procedures established by chapter 30," which govern ex parte reexamination. If reexamination is ordered, the Office is required to proceed with the reexamination. 35 U.S.C. 304 requires the Office to resolve any substantial new question of patentability determined to be raised:

Jump to MPEP SourceSNQ CriteriaReexamination OrderSubstantial New Question of Patentability
StatutoryInformativeAlways
[mpep-2821-93fdad92350044ab90ca77e4]
Office Must Resolve Substantial New Question of Patentability
Note:
The Office is required to resolve any substantial new question of patentability raised by a compliant request for supplemental examination.

If the patent owner files a request for supplemental examination that is in compliance with 35 U.S.C. 257 and all applicable rules, the Office is required under 35 U.S.C. 257(a) to conduct the examination and conclude the proceeding within three months from the filing date of the request. Any reexamination proceeding resulting from the supplemental examination proceeding must, in accordance with 35 U.S.C. 257(b), be conducted "according to the procedures established by chapter 30," which govern ex parte reexamination. If reexamination is ordered, the Office is required to proceed with the reexamination. 35 U.S.C. 304 requires the Office to resolve any substantial new question of patentability determined to be raised:

Jump to MPEP SourceSNQ CriteriaReexamination OrderSubstantial New Question of Patentability

Citations

Primary topicCitation
Ex Parte Reexamination
Reexamination Order
SNQ Criteria
35 U.S.C. § 257
Ex Parte Reexamination
Reexamination Order
SNQ Criteria
35 U.S.C. § 257(a)
Ex Parte Reexamination
Reexamination Order
SNQ Criteria
35 U.S.C. § 257(b)
Ex Parte Reexamination
Reexamination Order
35 U.S.C. § 257(c)(1)
Ex Parte Reexamination
Reexamination Order
35 U.S.C. § 257(c)(2)
Ex Parte Reexamination
Reexamination Order
SNQ Criteria
35 U.S.C. § 304
Ex Parte Reexamination
Reexamination Order
35 U.S.C. § 305
Ex Parte Reexamination
Reexamination Order
35 U.S.C. § 315(d)
Ex Parte Reexamination
Reexamination Order
35 U.S.C. § 325(d)
Ex Parte ReexaminationMPEP § 2283
Ex Parte Reexamination
Reexamination Order
Ethicon v. Quigg, 849 F.2d 1422, 7 USPQ2d 1152 (Fed. Cir. 1988)

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