MPEP § 1440 — Examination of Reissue Application (Annotated Rules)

§1440 Examination of Reissue Application

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

This page consolidates and annotates all enforceable requirements under MPEP § 1440, 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.

Examination of Reissue Application

This section addresses Examination of Reissue Application. Primary authority: 35 U.S.C. 1451, 35 U.S.C. 102, and 35 U.S.C. 112. Contains: 1 requirement, 1 prohibition, 1 guidance statement, 3 permissions, and 10 other statements.

Key Rules

Topic

Prior Art in Reissue

6 rules
StatutoryPermittedAlways
[mpep-1440-7d34e2e3143a9e677c85e927]
Differences in Prior Art Between Reissue and Original Patent
Note:
The prior art available during the examination of a reissue application may differ from that of the original patent depending on the claims' effective filing dates.

37 CFR 1.176 provides that an original claim, if re-presented in a reissue application, will be fully examined in the same manner, and subject to the same rules as if being presented for the first time in an original non-reissue, nonprovisional application, except that division will not be required by the examiner. See MPEP § 1450 and § 1451. As discussed below, however, the prior art available during the examination of the reissue application may differ from that available during the examination of the patent for which reissue is requested depending on the effective filing date of the claims in the reissue application. In addition, the application will be examined with respect to compliance with 37 CFR 1.171 – 1.178 relating specifically to reissue applications, for example, the reissue oath or declaration will be carefully reviewed for compliance with 37 CFR 1.175. See MPEP § 1444 for handling applications in which the oath or declaration lacks compliance with 37 CFR 1.175. Reissue applications with related litigation will be acted on by the examiner before any other special applications, and will be acted on immediately by the examiner, subject only to a 2-month delay after publication for examining reissue applications; see MPEP § 1441.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissueDesign NoveltyStatutory Authority for Examination
StatutoryInformativeAlways
[mpep-1440-c3923950339ca740963e2501]
AIA Revised Prior Art Determination for Examination
Note:
The Leahy-Smith America Invents Act revised the standard to determine what prior art is available during examination of an application, effective March 16, 2013.

The Leahy-Smith America Invents Act (AIA) revised 35 U.S.C. 102 and thereby, the standard to determine what prior art is available during examination of an application. See Public Law 112-29, 125 Stat. 284 (2011). The changes to 35 U.S.C. 102 and 103 in the AIA (first inventor to file provisions) do not apply to any application filed before March 16, 2013. Thus, any application filed before March 16, 2013, is governed by pre-AIA 35 U.S.C. 102 and 103. AIA 35 U.S.C. 102 and 103 apply to any patent application that contains or contained at any time a claim to a claimed invention that has an effective filing date that is on or after March 16, 2013. See MPEP §§ 2159 et seq. to determine whether an application is subject to examination under the AIA first inventor to file provisions, and MPEP §§ 2150 et seq. for examination of applications subject to those provisions.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissueAIA Overview and Effective DatesStatutory Authority for Examination
StatutoryPermittedAlways
[mpep-1440-e39932b4bf843400c9e77608]
Same Prior Art for Reissue as Original
Note:
The prior art available during the examination of a reissue application is generally the same as that examined in the original application.

The available prior art that can be applied during the examination of a reissue application is generally the same as that under which the original application was examined. In some cases, however, the reissue is subject to different available prior art than was the original application.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissueStatutory Authority for ExaminationReissue Examination
StatutoryInformativeAlways
[mpep-1440-9661477e1844707fc892d095]
Different Prior Art for Reissue
Note:
The examination of a reissue application may be subject to different prior art than the original application.

The available prior art that can be applied during the examination of a reissue application is generally the same as that under which the original application was examined. In some cases, however, the reissue is subject to different available prior art than was the original application.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissueReissue ExaminationReissue Patent Practice
StatutoryInformativeAlways
[mpep-1440-f497ce27a14c228f1f121e2b]
2013 Application Examined Under Pre-AIA Rules
Note:
The 2013 application is examined using pre-AIA 35 U.S.C. 102 and 103 for prior art, regardless of any claims relying on earlier support.

For example, a situation may arise where an application filed April 1, 2013, has a benefit claim to a prior application having a filing date of December 12, 2012, and all claims are fully supported by the 2012 application. In this situation, the 2013 application would be examined with respect to the prior art available under pre-AIA 35 U.S.C. 102 and 103. If a reissue application is filed on the subsequent patent in which a claim presented must rely on the April 1, 2013 disclosure for 35 U.S.C. 112 support (i.e., cannot rely solely on the parent application), that newly presented claim has an effective filing date of April 1, 2013. In this situation, the ENTIRE reissue application is now subject to the prior art available under AIA first inventor to file provisions. See MPEP §§ 2151 – 2156 for a discussion of the prior art available under the first inventor to file provisions of the AIA. In addition, this reissue application would be subject to pre-AIA 35 U.S.C. 102(g), because pre-AIA 35 U.S.C. 102(g) applies to each claim of an application for patent, and any patent issued thereon, if such application or patent contains, or contained at any time: (1) A claim to an invention having an effective filing date as defined in 35 U.S.C. 100(i) that occurs before March 16, 2013; or (2) a specific reference under 35 U.S.C. 120, 121, or 365(c) to any patent or application that contains, or contained at any time, such a claim. See MPEP § 2159.03.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissuePrior Art Under Pre-AIA 35 U.S.C. 102 (MPEP 2131-2138)Reissue Examination
StatutoryInformativeAlways
[mpep-1440-e7237c4b51aa80e55e046ed7]
Claims of Reissue Evaluated Like Original Patent
Note:
The claims in a reissue application are treated as if they were presented in the original patent for evaluating patentability over prior art, sharing its effective filing date.

The claims in a reissue application are treated as if they were presented in the patent being reissued for purposes of evaluating patentability over prior art, i.e., as if they had the same effective filing date as the original patent. See Grant v. Raymond, 31 U.S. 218, 244 (1832). The rationale for such treatment is that a reissue patent replaces the original patent, and thus is merely continuing the patent privilege of the original patent as opposed to being an independent (regular) patent with its own privilege (and its own term). Grant, 31 U.S. at 244. Accordingly, the claims of a reissue application are evaluated for patentability as if they had the same effective filing date as the original patent, even though the reissue application could not make a benefit claim under 35 U.S.C. 120 to the original patent.

Jump to MPEP Source · 37 CFR 1.176Prior Art in ReissueApplication Requisites for ExaminationReissue Examination
Topic

AIA Effective Dates

5 rules
StatutoryInformativeAlways
[mpep-1440-8d99338a7ce805386166e626]
AIA Does Not Apply to Pre-March 16, 2013 Applications
Note:
The AIA's changes to 35 U.S.C. 102 and 103 do not apply to applications filed before March 16, 2013.

The Leahy-Smith America Invents Act (AIA) revised 35 U.S.C. 102 and thereby, the standard to determine what prior art is available during examination of an application. See Public Law 112-29, 125 Stat. 284 (2011). The changes to 35 U.S.C. 102 and 103 in the AIA (first inventor to file provisions) do not apply to any application filed before March 16, 2013. Thus, any application filed before March 16, 2013, is governed by pre-AIA 35 U.S.C. 102 and 103. AIA 35 U.S.C. 102 and 103 apply to any patent application that contains or contained at any time a claim to a claimed invention that has an effective filing date that is on or after March 16, 2013. See MPEP §§ 2159 et seq. to determine whether an application is subject to examination under the AIA first inventor to file provisions, and MPEP §§ 2150 et seq. for examination of applications subject to those provisions.

Jump to MPEP Source · 37 CFR 1.176AIA Effective DatesKey Changes Under AIAPre-AIA 102(e) – Earlier US Applications (MPEP 2136)
StatutoryInformativeAlways
[mpep-1440-e8d32011ea0d64f9c575798f]
AIA Applies to Claims Filed On Or After March 16, 2013
Note:
This rule states that the AIA's first inventor to file provisions apply to any patent application containing claims with an effective filing date on or after March 16, 2013.

The Leahy-Smith America Invents Act (AIA) revised 35 U.S.C. 102 and thereby, the standard to determine what prior art is available during examination of an application. See Public Law 112-29, 125 Stat. 284 (2011). The changes to 35 U.S.C. 102 and 103 in the AIA (first inventor to file provisions) do not apply to any application filed before March 16, 2013. Thus, any application filed before March 16, 2013, is governed by pre-AIA 35 U.S.C. 102 and 103. AIA 35 U.S.C. 102 and 103 apply to any patent application that contains or contained at any time a claim to a claimed invention that has an effective filing date that is on or after March 16, 2013. See MPEP §§ 2159 et seq. to determine whether an application is subject to examination under the AIA first inventor to file provisions, and MPEP §§ 2150 et seq. for examination of applications subject to those provisions.

Jump to MPEP Source · 37 CFR 1.176AIA Effective DatesKey Changes Under AIADetermining Whether Application Is AIA or Pre-AIA
StatutoryInformativeAlways
[mpep-1440-1507d4b9fae083762d805802]
Reissue Application Subject to AIA Provisions
Note:
An entire reissue application must comply with the prior art available under AIA first inventor to file provisions and pre-AIA 35 U.S.C. 102(g) if it contains a claim with an effective filing date before March 16, 2013.

For example, a situation may arise where an application filed April 1, 2013, has a benefit claim to a prior application having a filing date of December 12, 2012, and all claims are fully supported by the 2012 application. In this situation, the 2013 application would be examined with respect to the prior art available under pre-AIA 35 U.S.C. 102 and 103. If a reissue application is filed on the subsequent patent in which a claim presented must rely on the April 1, 2013 disclosure for 35 U.S.C. 112 support (i.e., cannot rely solely on the parent application), that newly presented claim has an effective filing date of April 1, 2013. In this situation, the ENTIRE reissue application is now subject to the prior art available under AIA first inventor to file provisions. See MPEP §§ 2151 – 2156 for a discussion of the prior art available under the first inventor to file provisions of the AIA. In addition, this reissue application would be subject to pre-AIA 35 U.S.C. 102(g), because pre-AIA 35 U.S.C. 102(g) applies to each claim of an application for patent, and any patent issued thereon, if such application or patent contains, or contained at any time: (1) A claim to an invention having an effective filing date as defined in 35 U.S.C. 100(i) that occurs before March 16, 2013; or (2) a specific reference under 35 U.S.C. 120, 121, or 365(c) to any patent or application that contains, or contained at any time, such a claim. See MPEP § 2159.03.

Jump to MPEP Source · 37 CFR 1.176AIA Effective DatesKey Changes Under AIADetermining Whether Application Is AIA or Pre-AIA
StatutoryPermittedAlways
[mpep-1440-a6f6e92eeeee2c5188b10b94]
Pre-AIA Benefit Claim in Reissue
Note:
A benefit claim to an application filed before March 16, 2013, can be added in a reissue application based on an AIA patent if all claims are fully supported by the prior-filed application.

Another situation may arise in which a benefit claim to an application filed before March 16, 2013, is added in a reissue application based on an AIA patent. If all the claims ever presented in the reissue application and underlying patent are fully supported by the prior application filed before March 16, 2013, then the reissue application would be examined only under pre-AIA 35 U.S.C. 102 and 103 because the application was entitled to the benefit of the earlier-filed application as evidenced by appropriate benefit claim to the filing date of the prior-filed application.

Jump to MPEP Source · 37 CFR 1.176AIA Effective DatesPre-AIA 102(e) – Earlier US Applications (MPEP 2136)AIA Overview and Effective Dates
StatutoryInformativeAlways
[mpep-1440-18dd5c1217da80995a5e4bdc]
Reissue Examined Under Pre-AIA Standards If Claims Supported by Earlier Application
Note:
If all claims in the reissue application are supported by a prior application filed before March 16, 2013, the reissue is examined under pre-AIA 35 U.S.C. 102 and 103.

Another situation may arise in which a benefit claim to an application filed before March 16, 2013, is added in a reissue application based on an AIA patent. If all the claims ever presented in the reissue application and underlying patent are fully supported by the prior application filed before March 16, 2013, then the reissue application would be examined only under pre-AIA 35 U.S.C. 102 and 103 because the application was entitled to the benefit of the earlier-filed application as evidenced by appropriate benefit claim to the filing date of the prior-filed application.

Jump to MPEP Source · 37 CFR 1.176AIA Effective DatesPre-AIA 102(e) – Earlier US Applications (MPEP 2136)AIA Overview and Effective Dates
Topic

Statutory Authority for Examination

4 rules
StatutoryRequiredAlways
[mpep-1440-c40c32b01bdf1c95e230b034]
Restriction Between Original Claims and Unclaimed Subject Matter May Be Required
Note:
The rule states that restriction may be required between the original patent claims and any previously unclaimed subject matter, but not if it involves only the original claims. If restriction is needed, the original claims are considered constructively elected unless a disclaimer is filed.

(b) Restriction between subject matter of the original patent claims and previously unclaimed subject matter may be required (restriction involving only subject matter of the original patent claims will not be required). If restriction is required, the subject matter of the original patent claims will be held to be constructively elected unless a disclaimer of all the patent claims is filed in the reissue application, which disclaimer cannot be withdrawn by applicant.

Jump to MPEP Source · 37 CFR 1.176Statutory Authority for ExaminationExamination ProceduresRestriction and Election
StatutoryProhibitedAlways
[mpep-1440-03d599ce947c0b61e8fa442d]
Subject Matter of Original Claims Must Be Constructively Elected
Note:
If restriction is required, the original patent claims must be constructively elected unless all claims are disclaimed in the reissue application, which cannot be withdrawn.

(b) Restriction between subject matter of the original patent claims and previously unclaimed subject matter may be required (restriction involving only subject matter of the original patent claims will not be required). If restriction is required, the subject matter of the original patent claims will be held to be constructively elected unless a disclaimer of all the patent claims is filed in the reissue application, which disclaimer cannot be withdrawn by applicant.

Jump to MPEP Source · 37 CFR 1.176Statutory Authority for ExaminationExamination ProceduresRestriction and Election
StatutoryRecommendedAlways
[mpep-1440-2f105348d0e849ce8411a098]
Review Original Patent File History When Examining Reissue Application
Note:
Examiners must review the original patent file wrapper/file history when examining a reissue application.

The original patent file wrapper/file history should always be reviewed when examining a reissue application thereof.

Jump to MPEP Source · 37 CFR 1.176Statutory Authority for ExaminationExamination ProceduresReissue Application Filing
StatutoryInformativeAlways
[mpep-1440-aa19e238d197eec9c5b0a62f]
Claims of Reissue Evaluated as Original Patent
Note:
The claims in a reissue application are treated as if they were presented in the original patent for purposes of evaluating their patentability over prior art.

The claims in a reissue application are treated as if they were presented in the patent being reissued for purposes of evaluating patentability over prior art, i.e., as if they had the same effective filing date as the original patent. See Grant v. Raymond, 31 U.S. 218, 244 (1832). The rationale for such treatment is that a reissue patent replaces the original patent, and thus is merely continuing the patent privilege of the original patent as opposed to being an independent (regular) patent with its own privilege (and its own term). Grant, 31 U.S. at 244. Accordingly, the claims of a reissue application are evaluated for patentability as if they had the same effective filing date as the original patent, even though the reissue application could not make a benefit claim under 35 U.S.C. 120 to the original patent.

Jump to MPEP Source · 37 CFR 1.176Statutory Authority for ExaminationExamination ProceduresPrior Art in Reissue
Topic

Reissue Patent Practice

2 rules
StatutoryRequiredAlways
[mpep-1440-290420b8e0c4c28bd5ae7cb2]
Original Claims Examined Same As New Applications
Note:
Original claims re-presented in a reissue application are fully examined as if first presented in a new non-reissue, nonprovisional application.

37 CFR 1.176 provides that an original claim, if re-presented in a reissue application, will be fully examined in the same manner, and subject to the same rules as if being presented for the first time in an original non-reissue, nonprovisional application, except that division will not be required by the examiner. See MPEP § 1450 and § 1451. As discussed below, however, the prior art available during the examination of the reissue application may differ from that available during the examination of the patent for which reissue is requested depending on the effective filing date of the claims in the reissue application. In addition, the application will be examined with respect to compliance with 37 CFR 1.171 – 1.178 relating specifically to reissue applications, for example, the reissue oath or declaration will be carefully reviewed for compliance with 37 CFR 1.175. See MPEP § 1444 for handling applications in which the oath or declaration lacks compliance with 37 CFR 1.175. Reissue applications with related litigation will be acted on by the examiner before any other special applications, and will be acted on immediately by the examiner, subject only to a 2-month delay after publication for examining reissue applications; see MPEP § 1441.

Jump to MPEP Source · 37 CFR 1.176Reissue Patent PracticePrior Art for DesignsPrior Art in Reissue
StatutoryInformativeAlways
[mpep-1440-a149f5f00516dc5eacd5423d]
Requirement for Reexamining Pre-AIA Reissue Applications
Note:
The rule requires that pre-AIA reissue applications be examined under the pre-AIA standard, not the AIA first inventor to file provisions.

The Leahy-Smith America Invents Act (AIA) revised 35 U.S.C. 102 and thereby, the standard to determine what prior art is available during examination of an application. See Public Law 112-29, 125 Stat. 284 (2011). The changes to 35 U.S.C. 102 and 103 in the AIA (first inventor to file provisions) do not apply to any application filed before March 16, 2013. Thus, any application filed before March 16, 2013, is governed by pre-AIA 35 U.S.C. 102 and 103. AIA 35 U.S.C. 102 and 103 apply to any patent application that contains or contained at any time a claim to a claimed invention that has an effective filing date that is on or after March 16, 2013. See MPEP §§ 2159 et seq. to determine whether an application is subject to examination under the AIA first inventor to file provisions, and MPEP §§ 2150 et seq. for examination of applications subject to those provisions.

Jump to MPEP Source · 37 CFR 1.176Reissue Patent PracticeAIA Effective DatesKey Changes Under AIA
Topic

Rejections Specific to Reissue

1 rules
StatutoryInformativeAlways
[mpep-1440-a32f877fe6b784106bf7099d]
Oath/Declaration for Reissue Must Comply with Specific Requirements
Note:
The reissue oath or declaration must meet the specific requirements outlined in 37 CFR 1.175, as detailed in MPEP § 1444.

37 CFR 1.176 provides that an original claim, if re-presented in a reissue application, will be fully examined in the same manner, and subject to the same rules as if being presented for the first time in an original non-reissue, nonprovisional application, except that division will not be required by the examiner. See MPEP § 1450 and § 1451. As discussed below, however, the prior art available during the examination of the reissue application may differ from that available during the examination of the patent for which reissue is requested depending on the effective filing date of the claims in the reissue application. In addition, the application will be examined with respect to compliance with 37 CFR 1.171 – 1.178 relating specifically to reissue applications, for example, the reissue oath or declaration will be carefully reviewed for compliance with 37 CFR 1.175. See MPEP § 1444 for handling applications in which the oath or declaration lacks compliance with 37 CFR 1.175. Reissue applications with related litigation will be acted on by the examiner before any other special applications, and will be acted on immediately by the examiner, subject only to a 2-month delay after publication for examining reissue applications; see MPEP § 1441.

Jump to MPEP Source · 37 CFR 1.176Rejections Specific to ReissueReissue Oath/Declaration ContentReissue Oath or Declaration
Topic

Prior Art for Designs

1 rules
StatutoryInformativeAlways
[mpep-1440-53563378631d5cf302c414cc]
Reissue Applications with Litigation Examined First
Note:
Reissue applications involving related litigation are prioritized and examined immediately by the examiner, subject to a 2-month delay after publication.

37 CFR 1.176 provides that an original claim, if re-presented in a reissue application, will be fully examined in the same manner, and subject to the same rules as if being presented for the first time in an original non-reissue, nonprovisional application, except that division will not be required by the examiner. See MPEP § 1450 and § 1451. As discussed below, however, the prior art available during the examination of the reissue application may differ from that available during the examination of the patent for which reissue is requested depending on the effective filing date of the claims in the reissue application. In addition, the application will be examined with respect to compliance with 37 CFR 1.171 – 1.178 relating specifically to reissue applications, for example, the reissue oath or declaration will be carefully reviewed for compliance with 37 CFR 1.175. See MPEP § 1444 for handling applications in which the oath or declaration lacks compliance with 37 CFR 1.175. Reissue applications with related litigation will be acted on by the examiner before any other special applications, and will be acted on immediately by the examiner, subject only to a 2-month delay after publication for examining reissue applications; see MPEP § 1441.

Jump to MPEP Source · 37 CFR 1.176Prior Art for DesignsDisclosure of LitigationReissue and Litigation
Topic

Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)

1 rules
StatutoryPermittedAlways
[mpep-1440-a76ddd91ce59f774de034b30]
Reissue Claim Effective Date Determined by Parent
Note:
The effective filing date of a newly presented claim in a reissue application is determined by the parent application's filing date if it relies on that date for support under pre-AIA 112.

For example, a situation may arise where an application filed April 1, 2013, has a benefit claim to a prior application having a filing date of December 12, 2012, and all claims are fully supported by the 2012 application. In this situation, the 2013 application would be examined with respect to the prior art available under pre-AIA 35 U.S.C. 102 and 103. If a reissue application is filed on the subsequent patent in which a claim presented must rely on the April 1, 2013 disclosure for 35 U.S.C. 112 support (i.e., cannot rely solely on the parent application), that newly presented claim has an effective filing date of April 1, 2013. In this situation, the ENTIRE reissue application is now subject to the prior art available under AIA first inventor to file provisions. See MPEP §§ 2151 – 2156 for a discussion of the prior art available under the first inventor to file provisions of the AIA. In addition, this reissue application would be subject to pre-AIA 35 U.S.C. 102(g), because pre-AIA 35 U.S.C. 102(g) applies to each claim of an application for patent, and any patent issued thereon, if such application or patent contains, or contained at any time: (1) A claim to an invention having an effective filing date as defined in 35 U.S.C. 100(i) that occurs before March 16, 2013; or (2) a specific reference under 35 U.S.C. 120, 121, or 365(c) to any patent or application that contains, or contained at any time, such a claim. See MPEP § 2159.03.

Jump to MPEP Source · 37 CFR 1.176Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)Domestic Benefit Affecting Effective DateApplication Requisites for Examination
Topic

Determining Whether Application Is AIA or Pre-AIA

1 rules
StatutoryProhibitedAlways
[mpep-1440-9e2f67a6eb41a8b926df6531]
Claim Must Rely on April 1, 2013 Disclosure
Note:
A newly presented claim in a reissue application must rely on the April 1, 2013 disclosure for support and has that date as its effective filing date.

For example, a situation may arise where an application filed April 1, 2013, has a benefit claim to a prior application having a filing date of December 12, 2012, and all claims are fully supported by the 2012 application. In this situation, the 2013 application would be examined with respect to the prior art available under pre-AIA 35 U.S.C. 102 and 103. If a reissue application is filed on the subsequent patent in which a claim presented must rely on the April 1, 2013 disclosure for 35 U.S.C. 112 support (i.e., cannot rely solely on the parent application), that newly presented claim has an effective filing date of April 1, 2013. In this situation, the ENTIRE reissue application is now subject to the prior art available under AIA first inventor to file provisions. See MPEP §§ 2151 – 2156 for a discussion of the prior art available under the first inventor to file provisions of the AIA. In addition, this reissue application would be subject to pre-AIA 35 U.S.C. 102(g), because pre-AIA 35 U.S.C. 102(g) applies to each claim of an application for patent, and any patent issued thereon, if such application or patent contains, or contained at any time: (1) A claim to an invention having an effective filing date as defined in 35 U.S.C. 100(i) that occurs before March 16, 2013; or (2) a specific reference under 35 U.S.C. 120, 121, or 365(c) to any patent or application that contains, or contained at any time, such a claim. See MPEP § 2159.03.

Jump to MPEP Source · 37 CFR 1.176Determining Whether Application Is AIA or Pre-AIADetermining AIA vs Pre-AIA Applicability (MPEP 2159)Application Requisites for Examination
Topic

Reissue Patent Term

1 rules
StatutoryInformativeAlways
[mpep-1440-e5dcc68cd0fda82e43664d80]
Claims of Reissue Evaluated Like Original Patent
Note:
The claims in a reissue application are treated as if they were part of the original patent for evaluating their patentability, regardless of the filing date difference.

The claims in a reissue application are treated as if they were presented in the patent being reissued for purposes of evaluating patentability over prior art, i.e., as if they had the same effective filing date as the original patent. See Grant v. Raymond, 31 U.S. 218, 244 (1832). The rationale for such treatment is that a reissue patent replaces the original patent, and thus is merely continuing the patent privilege of the original patent as opposed to being an independent (regular) patent with its own privilege (and its own term). Grant, 31 U.S. at 244. Accordingly, the claims of a reissue application are evaluated for patentability as if they had the same effective filing date as the original patent, even though the reissue application could not make a benefit claim under 35 U.S.C. 120 to the original patent.

Jump to MPEP Source · 37 CFR 1.176Reissue Patent TermReissue Patent IssuanceReissue Patent Practice
Topic

Application Requisites for Examination

1 rules
StatutoryInformativeAlways
[mpep-1440-2aaebf453a3899ced35d0a51]
Claims of Reissue Evaluated as Original Patent
Note:
The claims in a reissue application are evaluated for patentability as if they had the same effective filing date as the original patent, even though no benefit claim can be made under 35 U.S.C. 120.

The claims in a reissue application are treated as if they were presented in the patent being reissued for purposes of evaluating patentability over prior art, i.e., as if they had the same effective filing date as the original patent. See Grant v. Raymond, 31 U.S. 218, 244 (1832). The rationale for such treatment is that a reissue patent replaces the original patent, and thus is merely continuing the patent privilege of the original patent as opposed to being an independent (regular) patent with its own privilege (and its own term). Grant, 31 U.S. at 244. Accordingly, the claims of a reissue application are evaluated for patentability as if they had the same effective filing date as the original patent, even though the reissue application could not make a benefit claim under 35 U.S.C. 120 to the original patent.

Jump to MPEP Source · 37 CFR 1.176Application Requisites for ExaminationReissue Patent PracticeStatutory Authority for Examination

Citations

Primary topicCitation
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
35 U.S.C. § 100(i)
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
Reissue Patent Practice
35 U.S.C. § 102
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
35 U.S.C. § 102(g)
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
35 U.S.C. § 112
AIA Effective Dates
Application Requisites for Examination
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
Reissue Patent Term
Statutory Authority for Examination
35 U.S.C. § 120
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
35 U.S.C. § 1451
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
37 CFR § 1.171
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
37 CFR § 1.175
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
37 CFR § 1.176
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
MPEP § 1441
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
MPEP § 1444
Prior Art for Designs
Prior Art in Reissue
Reissue Patent Practice
Rejections Specific to Reissue
MPEP § 1450
AIA Effective Dates
Prior Art in Reissue
Reissue Patent Practice
MPEP § 2150
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
MPEP § 2151
AIA Effective Dates
Prior Art in Reissue
Reissue Patent Practice
MPEP § 2159
AIA Effective Dates
Determining Whether Application Is AIA or Pre-AIA
Pre-AIA 102(e) – Earlier US Applications (MPEP 2136)
Prior Art in Reissue
MPEP § 2159.03
Application Requisites for Examination
Prior Art in Reissue
Reissue Patent Term
Statutory Authority for Examination
See Grant v. Raymond, 31 U.S. 218, 244 (1832)

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