MPEP § 821.04 — Rejoinder (Annotated Rules)

§821.04 Rejoinder

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

This page consolidates and annotates all enforceable requirements under MPEP § 821.04, 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.

Rejoinder

This section addresses Rejoinder. Primary authority: 35 U.S.C. 101, 35 U.S.C. 112, and 37 CFR 1.104. Contains: 3 requirements, 3 guidance statements, 3 permissions, and 2 other statements.

Key Rules

Topic

Patent Eligibility

4 rules
MPEP GuidanceRequiredAlways
[mpep-821-04-ec24bdd1601384c54943f6ec]
Claim Must Depend on Allowable Claim
Note:
A claim to a nonelected invention must depend from or require all limitations of an allowable claim to be eligible for rejoinder.

In order to be eligible for rejoinder, a claim to a nonelected invention must depend from or otherwise require all the limitations of an allowable claim. A withdrawn claim that does not require all the limitations of an allowable claim will not be rejoined. Furthermore, where restriction was required between a product and a process of making and/or using the product, and the product invention was elected and subsequently found allowable, all claims to a nonelected process invention must depend from or otherwise require all the limitations of an allowable claim for the claims directed to that process invention to be eligible for rejoinder. See MPEP § 821.04(b). In order to retain the right to rejoinder, applicant is advised that the claims to the nonelected invention(s) should be amended during prosecution to require the limitations of the elected invention. Failure to do so may result in a loss of the right to rejoinder.

Jump to MPEP SourcePatent Eligibility
MPEP GuidanceRequiredAlways
[mpep-821-04-611163b501c237d83493008a]
Requirement for Nonelected Process Claims to Depend on Product Claim
Note:
Nonelected process claims must depend from or require all limitations of an allowable product claim to be rejoined after the product invention is found allowable.

In order to be eligible for rejoinder, a claim to a nonelected invention must depend from or otherwise require all the limitations of an allowable claim. A withdrawn claim that does not require all the limitations of an allowable claim will not be rejoined. Furthermore, where restriction was required between a product and a process of making and/or using the product, and the product invention was elected and subsequently found allowable, all claims to a nonelected process invention must depend from or otherwise require all the limitations of an allowable claim for the claims directed to that process invention to be eligible for rejoinder. See MPEP § 821.04(b). In order to retain the right to rejoinder, applicant is advised that the claims to the nonelected invention(s) should be amended during prosecution to require the limitations of the elected invention. Failure to do so may result in a loss of the right to rejoinder.

Jump to MPEP SourcePatent Eligibility
MPEP GuidanceRecommendedAlways
[mpep-821-04-083553c8733857ab917097f5]
Claims Must Depend on Elected Invention
Note:
During prosecution, claims to nonelected inventions must depend from or require all limitations of the elected invention to retain the right to rejoinder.

In order to be eligible for rejoinder, a claim to a nonelected invention must depend from or otherwise require all the limitations of an allowable claim. A withdrawn claim that does not require all the limitations of an allowable claim will not be rejoined. Furthermore, where restriction was required between a product and a process of making and/or using the product, and the product invention was elected and subsequently found allowable, all claims to a nonelected process invention must depend from or otherwise require all the limitations of an allowable claim for the claims directed to that process invention to be eligible for rejoinder. See MPEP § 821.04(b). In order to retain the right to rejoinder, applicant is advised that the claims to the nonelected invention(s) should be amended during prosecution to require the limitations of the elected invention. Failure to do so may result in a loss of the right to rejoinder.

Jump to MPEP SourcePatent Eligibility
MPEP GuidancePermittedAlways
[mpep-821-04-a2e281697a8e2ea3b49428d7]
Requirement for Claim Dependence on Elected Invention
Note:
Claims to a nonelected invention must depend from or require all limitations of an allowable claim to be eligible for rejoinder.

In order to be eligible for rejoinder, a claim to a nonelected invention must depend from or otherwise require all the limitations of an allowable claim. A withdrawn claim that does not require all the limitations of an allowable claim will not be rejoined. Furthermore, where restriction was required between a product and a process of making and/or using the product, and the product invention was elected and subsequently found allowable, all claims to a nonelected process invention must depend from or otherwise require all the limitations of an allowable claim for the claims directed to that process invention to be eligible for rejoinder. See MPEP § 821.04(b). In order to retain the right to rejoinder, applicant is advised that the claims to the nonelected invention(s) should be amended during prosecution to require the limitations of the elected invention. Failure to do so may result in a loss of the right to rejoinder.

Jump to MPEP SourcePatent Eligibility
Topic

First Action on Merits (FAOM)

3 rules
StatutoryPermittedAlways
[mpep-821-04-9b1b6b6dd0e7f2158ac570a9]
Final Action on Rejoined Claims
Note:
If claims rejoined after the first Office action are unpatentable, the next Office action may be made final.

The provisions of MPEP § 706.07 govern the propriety of making an Office action final in rejoinder situations. If rejoinder occurs after the first Office action on the merits, and if any of the rejoined claims are unpatentable, e.g., if a rejection under 35 U.S.C. 112, first paragraph is made, then the next Office action may be made final where the new ground of rejection was necessitated by applicant’s amendment (or based on information submitted in an IDS filed during the time period set forth in 37 CFR 1.97(c) with the fee set forth in 37 CFR 1.17(p)). See MPEP § 706.07(a).

Jump to MPEP Source · 37 CFR 1.97(c)First Action on Merits (FAOM)First Action on MeritsNon-Final Action Content
StatutoryRequiredAlways
[mpep-821-04-9d0fb595c9f4855e3882c280]
First Office Action on Merits Not Final If Process Claim Does Not Comply with 112
Note:
The first Office action on merits should not be made final if the rejoined process claim does not meet the requirements of 35 U.S.C. 112, first paragraph.

If restriction is required between product and process claims, for example, and all the product claims would be allowable in the first Office action on the merits, upon rejoinder of the process claims, it would not be proper to make the first Office action on the merits final if the rejoined process claim did not comply with the requirements of 35 U.S.C. 112, first paragraph. This is because the rejoinder did not occur after the first Office action on the merits. Note that the provisions of MPEP § 706.07(b) govern the propriety of making a first Office action on the merits final.

Jump to MPEP SourceFirst Action on Merits (FAOM)First Action on MeritsTypes of Office Actions
StatutoryInformativeAlways
[mpep-821-04-81a8a614437a9bd9592ff893]
Proper First Office Action on Merits Not Final If Process Claims Do Not Comply
Note:
The first office action on the merits should not be made final if rejoined process claims do not comply with 35 U.S.C. 112, first paragraph.

If restriction is required between product and process claims, for example, and all the product claims would be allowable in the first Office action on the merits, upon rejoinder of the process claims, it would not be proper to make the first Office action on the merits final if the rejoined process claim did not comply with the requirements of 35 U.S.C. 112, first paragraph. This is because the rejoinder did not occur after the first Office action on the merits. Note that the provisions of MPEP § 706.07(b) govern the propriety of making a first Office action on the merits final.

Jump to MPEP SourceFirst Action on Merits (FAOM)First Action on MeritsTypes of Office Actions
Topic

Obviousness

2 rules
StatutoryPermittedAlways
[mpep-821-04-af5eac015ba7b959e44a9a34]
Remaining Application May Be Rejected for Obviousness-Type Double Patenting
Note:
If one application issues as a patent, the remaining application may be rejected under obviousness-type double patenting unless a terminal disclaimer is filed.

Where applicant voluntarily presents claims to the product and process, for example, in separate applications (i.e., no restriction requirement was made by the Office), and one of the applications issues as a patent, the remaining application may be rejected under the doctrine of obviousness-type double patenting, where appropriate (see MPEP § 804§ 804.03), and applicant may overcome the rejection by the filing of a terminal disclaimer under 37 CFR 1.321(c) where appropriate. Similarly, if copending applications separately present product and process claims, provisional obviousness-type double patenting rejections should be made where appropriate. However, once a determination as to the patentability of the product has been reached, any process claim directed to making or using an allowable product should not be rejected over prior art without consultation with a Technology Center Director.

Jump to MPEP Source · 37 CFR 1.321(c)ObviousnessRestriction Requirement (MPEP 802-803)Restriction and Election Practice (MPEP Chapter 800)
StatutoryRecommendedAlways
[mpep-821-04-d38ce96d6692e91597779506]
Provisional Obviousness-Type Double Patenting for Copending Product and Process Claims
Note:
When copending applications separately claim products and processes, provisional obviousness-type double patenting rejections should be made if appropriate. After determining product patentability, process claims making or using the allowable product cannot be rejected without a Technology Center Director’s consultation.

Where applicant voluntarily presents claims to the product and process, for example, in separate applications (i.e., no restriction requirement was made by the Office), and one of the applications issues as a patent, the remaining application may be rejected under the doctrine of obviousness-type double patenting, where appropriate (see MPEP § 804§ 804.03), and applicant may overcome the rejection by the filing of a terminal disclaimer under 37 CFR 1.321(c) where appropriate. Similarly, if copending applications separately present product and process claims, provisional obviousness-type double patenting rejections should be made where appropriate. However, once a determination as to the patentability of the product has been reached, any process claim directed to making or using an allowable product should not be rejected over prior art without consultation with a Technology Center Director.

Jump to MPEP Source · 37 CFR 1.321(c)ObviousnessRejoinder of Claims (MPEP 821.04)
Topic

35 U.S.C. 103 – Obviousness

2 rules
StatutoryInformativeAlways
[mpep-821-04-143eebc7592c9723363b51ff]
35 U.S.C. 103(b) Applicability to Biotech Processes and Compositions
Note:
Determines the applicability of 35 U.S.C. 103(b) to biotechnological processes and compositions of matter.

See MPEP § 2147 for the applicability of 35 U.S.C. 103(b) to biotechnological processes and compositions of matter.

StatutoryInformativeAlways
[mpep-821-04-5a6635aa0802215e5d1ca0ca]
Guidance for Process Claims Using Novel Products
Note:
Provides guidance on how to handle process claims that make or use novel, nonobvious products under section 103 of the U.S. patent law.

See MPEP § 2116.01 for guidance on the treatment of process claims which make or use a novel, nonobvious product.

Topic

Statutory Authority for Examination

2 rules
MPEP GuidanceRecommendedAlways
[mpep-821-04-f860661b0f5fe3331f09b236]
Restriction Reconsideration When All Elected Claims Allowable
Note:
When all claims of the elected invention are allowable, reconsider the restriction requirement and consider rejoinder for nonelected inventions.

The propriety of a restriction requirement should be reconsidered when all the claims directed to the elected invention are in condition for allowance, and the nonelected invention(s) should be considered for rejoinder. Rejoinder involves withdrawal of a restriction requirement between an allowable elected invention and a nonelected invention and examination of the formerly nonelected invention on the merits.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresExaminer's Action at Allowance
MPEP GuidanceInformativeAlways
[mpep-821-04-49041b474e5979629bdc1692]
Requirement for Reconsidering Restriction and Examining Formerly Nonelected Invention
Note:
When all claims of the elected invention are in condition for allowance, a restriction requirement should be reconsidered, allowing examination of the formerly nonelected invention on its merits.

The propriety of a restriction requirement should be reconsidered when all the claims directed to the elected invention are in condition for allowance, and the nonelected invention(s) should be considered for rejoinder. Rejoinder involves withdrawal of a restriction requirement between an allowable elected invention and a nonelected invention and examination of the formerly nonelected invention on the merits.

Jump to MPEP SourceStatutory Authority for ExaminationExamination ProceduresExaminer's Action at Allowance
Topic

Examiner's Action at Allowance

1 rules
StatutoryRequiredAlways
[mpep-821-04-72a90cb5ce6a3b9a10a3d387]
Rejoined Claims Must Meet All Patentability Criteria
Note:
Rejoined claims must be fully examined and meet the requirements of 35 U.S.C. 101, 102, 103, and 112 to be allowable.

Rejoined claims must be fully examined for patentability in accordance with 37 CFR 1.104. Thus, to be allowable, the rejoined claims must meet all criteria for patentability including the requirements of 35 U.S.C. 101, 102, 103, and 112.

Jump to MPEP Source · 37 CFR 1.104Examiner's Action at AllowanceAllowance PracticeExaminer's Action (37 CFR 1.104)
Topic

Restriction and Election Practice (MPEP Chapter 800)

1 rules
StatutoryRequiredAlways
[mpep-821-04-4a639f25744da05de6506beb]
Requirement for Restriction Withdrawal
Note:
The requirement to restrict between rejoined inventions must be withdrawn, and claims in a divisional application that are anticipated by or obvious over the parent application may face double patenting rejections.

The requirement for restriction between the rejoined inventions must be withdrawn. Any claim(s) presented in a divisional application that are anticipated by, or rendered obvious over, the claims of the parent application may be subject to a double patenting rejection when the restriction requirement is withdrawn in the parent application. In re Ziegler, 443 F.2d 1211, 1215, 170 USPQ 129, 131-32 (CCPA 1971). See also MPEP §§ 804.01 and 821.04(a).

Jump to MPEP SourceRestriction and Election Practice (MPEP Chapter 800)Rejoinder of Claims (MPEP 821.04)Divisional Applications (MPEP 201.06)
Topic

Divisional Applications (MPEP 201.06)

1 rules
StatutoryPermittedAlways
[mpep-821-04-7101ddee622850ca7da0742d]
Divisional Claims Must Not Anticipate Parent
Note:
Divisional claims must not be anticipated by or rendered obvious over the parent application's claims when a restriction requirement is withdrawn in the parent application.

The requirement for restriction between the rejoined inventions must be withdrawn. Any claim(s) presented in a divisional application that are anticipated by, or rendered obvious over, the claims of the parent application may be subject to a double patenting rejection when the restriction requirement is withdrawn in the parent application. In re Ziegler, 443 F.2d 1211, 1215, 170 USPQ 129, 131-32 (CCPA 1971). See also MPEP §§ 804.01 and 821.04(a).

Jump to MPEP SourceDivisional Applications (MPEP 201.06)Restriction Requirement (MPEP 802-803)Restriction and Election Practice (MPEP Chapter 800)
Topic

Types of Office Actions

1 rules
StatutoryInformativeAlways
[mpep-821-04-ee5afb94da690d9aa92d7586]
Final Office Action in Rejoinder Situations Governed by MPEP § 706.07
Note:
The rule specifies that an Office action can be made final after rejoinder if any claims are unpatentable due to a new ground of rejection necessitated by the applicant's amendment or IDS submission.

The provisions of MPEP § 706.07 govern the propriety of making an Office action final in rejoinder situations. If rejoinder occurs after the first Office action on the merits, and if any of the rejoined claims are unpatentable, e.g., if a rejection under 35 U.S.C. 112, first paragraph is made, then the next Office action may be made final where the new ground of rejection was necessitated by applicant’s amendment (or based on information submitted in an IDS filed during the time period set forth in 37 CFR 1.97(c) with the fee set forth in 37 CFR 1.17(p)). See MPEP § 706.07(a).

Jump to MPEP Source · 37 CFR 1.97(c)Types of Office ActionsExaminer's Action (37 CFR 1.104)Office Actions and Responses

Citations

Primary topicCitation
Examiner's Action at Allowance35 U.S.C. § 101
35 U.S.C. 103 – Obviousness35 U.S.C. § 103(b)
First Action on Merits (FAOM)
Types of Office Actions
35 U.S.C. § 112
Examiner's Action at Allowance37 CFR § 1.104
37 CFR § 1.116
First Action on Merits (FAOM)
Types of Office Actions
37 CFR § 1.17(p)
Obviousness37 CFR § 1.321(c)
First Action on Merits (FAOM)
Types of Office Actions
37 CFR § 1.97(c)
Obviousness37 CFR § 804.03
35 U.S.C. 103 – ObviousnessMPEP § 2116.01
35 U.S.C. 103 – ObviousnessMPEP § 2147
First Action on Merits (FAOM)
Types of Office Actions
MPEP § 706.07
First Action on Merits (FAOM)
Types of Office Actions
MPEP § 706.07(a)
First Action on Merits (FAOM)MPEP § 706.07(b)
ObviousnessMPEP § 804
Divisional Applications (MPEP 201.06)
Restriction and Election Practice (MPEP Chapter 800)
MPEP § 804.01
Patent EligibilityMPEP § 821.04(b)

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