MPEP § 2001.06(b) — Information Relating to or From Copending United States Patent Applications (Annotated Rules)

§2001.06(b) Information Relating to or From Copending United States Patent Applications

USPTO MPEP version: BlueIron's Update: 2026-01-17

This page consolidates and annotates all enforceable requirements under MPEP § 2001.06(b), 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.

Information Relating to or From Copending United States Patent Applications

This section addresses Information Relating to or From Copending United States Patent Applications. Primary authority: 37 CFR 1.56. Contains: 2 requirements, 1 prohibition, 1 permission, and 4 other statements.

Key Rules

Topic

Scope of Duty

3 rules
StatutoryPermittedAlways
[mpep-2001-06-b-f88281a6298ff4095e461a5f]
Disclosure of Copending US Applications Material to Patentability
Note:
Individuals must disclose to examiners any copending US applications by inventors or assignees that are material to the patentability of their current application.

The individuals covered by 37 CFR 1.56 have a duty to bring to the attention of the examiner, or other Office official involved with the examination of a particular application, information within their knowledge as to other copending United States applications which are “material to patentability” of the application in question. This may include providing the identification of pending or abandoned applications filed by at least one of the inventors or assigned to the same assignee as the current application that disclose similar subject matter that are not otherwise identified in the current application. As set forth by the court in Armour & Co. v. Swift & Co., 466 F.2d 767, 779, 175 USPQ 70, 79 (7th Cir. 1972):

Jump to MPEP Source · 37 CFR 1.56Scope of DutyMaterial Information DefinitionDuty of Disclosure Fundamentals
StatutoryInformativeAlways
[mpep-2001-06-b-88c2999fa69f54a50370c200]
Copending US Patent Applications Must Be Disclosed
Note:
Inventors must disclose to the examiner any copending U.S. applications they know about that are material to patentability.

The individuals covered by 37 CFR 1.56 have a duty to bring to the attention of the examiner, or other Office official involved with the examination of a particular application, information within their knowledge as to other copending United States applications which are “material to patentability” of the application in question. This may include providing the identification of pending or abandoned applications filed by at least one of the inventors or assigned to the same assignee as the current application that disclose similar subject matter that are not otherwise identified in the current application. As set forth by the court in Armour & Co. v. Swift & Co., 466 F.2d 767, 779, 175 USPQ 70, 79 (7th Cir. 1972):

Jump to MPEP Source · 37 CFR 1.56Scope of DutyMaterial Information DefinitionDuty of Disclosure Fundamentals
StatutoryProhibitedAlways
[mpep-2001-06-b-962246c62d9afd1838c424e8]
Copending Applications Must Be Disclosed to Examiner
Note:
Individuals covered by 37 CFR 1.56 must bring any copending applications that are material to the patentability of a particular application to the examiner's attention.

Accordingly, the individuals covered by 37 CFR 1.56 cannot assume that the examiner of a particular application is necessarily aware of other applications which are “material to patentability” of the application in question, but must instead bring such other applications to the attention of the examiner. See Regeneron Pharm., Inc. v. Merus B.V., 144 F. Supp. 3d 530, 560 (S.D.N.Y. 2015), and Dayco Prod., Inc. v. Total Containment, Inc., 329 F.3d 1358, 1365-69, 66 USPQ2d 1801, 1806-08 (Fed. Cir. 2003). For example, if a particular inventor has different applications pending which disclose similar subject matter but claim patentably indistinct inventions, the existence of other applications must be disclosed to the examiner of each of the involved applications. Similarly, the prior art references from one application must be made of record in another subsequent application if such prior art references are “material to patentability” of the subsequent application. See Dayco Prod., 329 F.3d at 1369, 66 USPQ2d at 1808.

Jump to MPEP Source · 37 CFR 1.56Scope of DutyMaterial Information DefinitionDuty of Disclosure Fundamentals
Topic

Individuals Under Duty

3 rules
StatutoryInformativeAlways
[mpep-2001-06-b-6daa82d00f4ce7138b2a7f41]
Individuals Must Disclose Copending Applications
Note:
Individuals covered by 37 CFR 1.56 must disclose to examiners any copending applications that are material to the patentability of the application in question.

Accordingly, the individuals covered by 37 CFR 1.56 cannot assume that the examiner of a particular application is necessarily aware of other applications which are “material to patentability” of the application in question, but must instead bring such other applications to the attention of the examiner. See Regeneron Pharm., Inc. v. Merus B.V., 144 F. Supp. 3d 530, 560 (S.D.N.Y. 2015), and Dayco Prod., Inc. v. Total Containment, Inc., 329 F.3d 1358, 1365-69, 66 USPQ2d 1801, 1806-08 (Fed. Cir. 2003). For example, if a particular inventor has different applications pending which disclose similar subject matter but claim patentably indistinct inventions, the existence of other applications must be disclosed to the examiner of each of the involved applications. Similarly, the prior art references from one application must be made of record in another subsequent application if such prior art references are “material to patentability” of the subsequent application. See Dayco Prod., 329 F.3d at 1369, 66 USPQ2d at 1808.

Jump to MPEP Source · 37 CFR 1.56Individuals Under DutyScope of DutyMaterial Information Definition
StatutoryRequiredAlways
[mpep-2001-06-b-dcce55432995a3d212ecb0af]
Disclosure of Copending Applications Required
Note:
Inventors must disclose to examiners any copending applications that may be material to the patentability of their current application.

Accordingly, the individuals covered by 37 CFR 1.56 cannot assume that the examiner of a particular application is necessarily aware of other applications which are “material to patentability” of the application in question, but must instead bring such other applications to the attention of the examiner. See Regeneron Pharm., Inc. v. Merus B.V., 144 F. Supp. 3d 530, 560 (S.D.N.Y. 2015), and Dayco Prod., Inc. v. Total Containment, Inc., 329 F.3d 1358, 1365-69, 66 USPQ2d 1801, 1806-08 (Fed. Cir. 2003). For example, if a particular inventor has different applications pending which disclose similar subject matter but claim patentably indistinct inventions, the existence of other applications must be disclosed to the examiner of each of the involved applications. Similarly, the prior art references from one application must be made of record in another subsequent application if such prior art references are “material to patentability” of the subsequent application. See Dayco Prod., 329 F.3d at 1369, 66 USPQ2d at 1808.

Jump to MPEP Source · 37 CFR 1.56Individuals Under DutyMaterial Information DefinitionDuty of Disclosure Fundamentals
StatutoryInformativeAlways
[mpep-2001-06-b-83e5a6c59819c425b348a724]
Copending Applications Must Be Disclosed to Examiner
Note:
Individuals covered by 37 CFR 1.56 must disclose other copending applications that are material to the patentability of their current application.

Accordingly, the individuals covered by 37 CFR 1.56 cannot assume that the examiner of a particular application is necessarily aware of other applications which are “material to patentability” of the application in question, but must instead bring such other applications to the attention of the examiner. See Regeneron Pharm., Inc. v. Merus B.V., 144 F. Supp. 3d 530, 560 (S.D.N.Y. 2015), and Dayco Prod., Inc. v. Total Containment, Inc., 329 F.3d 1358, 1365-69, 66 USPQ2d 1801, 1806-08 (Fed. Cir. 2003). For example, if a particular inventor has different applications pending which disclose similar subject matter but claim patentably indistinct inventions, the existence of other applications must be disclosed to the examiner of each of the involved applications. Similarly, the prior art references from one application must be made of record in another subsequent application if such prior art references are “material to patentability” of the subsequent application. See Dayco Prod., 329 F.3d at 1369, 66 USPQ2d at 1808.

Jump to MPEP Source · 37 CFR 1.56Individuals Under DutyScope of DutyMaterial Information Definition
Topic

First Action on Merits (FAOM)

2 rules
StatutoryRequiredAlways
[mpep-2001-06-b-c4e02182e96cf0c73910402a]
First Office Action Must Indicate Prior Art Review
Note:
The examiner must indicate in the first Office action whether prior art from a related earlier application has been reviewed.

If the application under examination is identified as a continuation, divisional, or continuation-in-part of an earlier application, the examiner will consider the prior art properly cited in the earlier application. See MPEP § 609 and MPEP § 719.05, subsection (II)(A), example J. The examiner must indicate in the first Office action whether the prior art in a related earlier application has been reviewed. Accordingly, no separate citation of the same prior art need be made in the later application, unless applicant wants a listing of the prior art printed on the face of the patent.

Jump to MPEP SourceFirst Action on Merits (FAOM)Types of Office ActionsExaminer's Action (37 CFR 1.104)
StatutoryInformativeAlways
[mpep-2001-06-b-c2e2cf40cb84c9d52af75d75]
No Separate Prior Art Citation Needed for Later Application
Note:
Examiner must consider prior art cited in an earlier application, and no separate citation is required in the later application unless applicant requests it on the patent face.

If the application under examination is identified as a continuation, divisional, or continuation-in-part of an earlier application, the examiner will consider the prior art properly cited in the earlier application. See MPEP § 609 and MPEP § 719.05, subsection (II)(A), example J. The examiner must indicate in the first Office action whether the prior art in a related earlier application has been reviewed. Accordingly, no separate citation of the same prior art need be made in the later application, unless applicant wants a listing of the prior art printed on the face of the patent.

Jump to MPEP SourceFirst Action on Merits (FAOM)Types of Office ActionsStatutory Authority for Examination
Topic

Statutory Authority for Examination

1 rules
StatutoryInformativeAlways
[mpep-2001-06-b-018edc1532a103653aaf4e82]
Examiner Considers Prior Art of Earlier Application
Note:
If the application is a continuation, divisional, or continuation-in-part, the examiner will review prior art cited in the earlier application and indicate whether it has been reviewed in the first Office action.

If the application under examination is identified as a continuation, divisional, or continuation-in-part of an earlier application, the examiner will consider the prior art properly cited in the earlier application. See MPEP § 609 and MPEP § 719.05, subsection (II)(A), example J. The examiner must indicate in the first Office action whether the prior art in a related earlier application has been reviewed. Accordingly, no separate citation of the same prior art need be made in the later application, unless applicant wants a listing of the prior art printed on the face of the patent.

Jump to MPEP SourceStatutory Authority for ExaminationFirst Action on Merits (FAOM)Types of Office Actions

Citations

Primary topicCitation
Individuals Under Duty
Scope of Duty
37 CFR § 1.56
MPEP § 2004
First Action on Merits (FAOM)
Statutory Authority for Examination
MPEP § 609
First Action on Merits (FAOM)
Statutory Authority for Examination
MPEP § 719.05

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: 2026-01-17