MPEP § 604 — Substitute Statements (Annotated Rules)

§604 Substitute Statements

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

This page consolidates and annotates all enforceable requirements under MPEP § 604, 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.

Substitute Statements

This section addresses Substitute Statements. Primary authority: 35 U.S.C. 115(d), 37 CFR 1.64, and 37 CFR 1.64(a). Contains: 8 requirements, 1 prohibition, 2 guidance statements, 4 permissions, and 3 other statements.

Key Rules

Topic

Assignee as Applicant Signature

8 rules
StatutoryProhibitedAlways
[mpep-604-c3d3883c30b996f6c6ba354c]
Joint Inventors Must Execute Substitute Statement
Note:
If one joint inventor refuses to sign the oath, all other joint inventors who are applicants must sign a substitute statement on their behalf.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement 1. If the inventors are the applicant and one of the inventors refuses to execute the oath or declaration or cannot be found or reached, then under 37 CFR 1.45 all of the other joint inventors who are the applicant (and who executed an oath or declaration) must execute the substitute statement on behalf of the non-signing inventor. Joint inventors cannot execute a substitute statement for a deceased or legally incapacitated joint inventor.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureJoint Applicant SignaturesSubstitute Signature
StatutoryPermittedAlways
[mpep-604-bce6b5dc3d4f315304ad411e]
Substitute Statement by Legal Representative or Applicant
Note:
If an inventor is deceased or legally incapacitated, a legal representative can execute the substitute statement under 37 CFR 1.43, or the applicant can do so under 37 CFR 1.46.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

If the inventor is deceased or legally incapacitated, then the substitute statement may be executed by a legal representative under 37 CFR 1.43 or by the applicant under 37 CFR 1.46.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureSubstitute SignatureAssignee/Applicant Signature
StatutoryInformativeAlways
[mpep-604-ffcaf0c73cc78f1e53eba755]
Legal Representative Must Execute Substitute Statement for Deceased Inventor
Note:
Where inventors are the applicant, a legal representative must execute the substitute statement for a deceased or legally incapacitated inventor, and the Office will recognize the legal representative as an applicant in their place.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

Where the inventors are the applicant, only the legal representative would execute the substitute statement for the deceased or legally incapacitated inventor, and the Office would recognize the legal representative as an applicant in place of the deceased or legally incapacitated inventor.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureSubstitute SignatureInventor Signature Requirements
StatutoryPermittedAlways
[mpep-604-0930a1ff9a837a33ea5a0ad7]
Assignee Can Execute Substitute Statement
Note:
An assignee named as the applicant under 37 CFR 1.46 can execute a substitute statement without needing a legal representative's signature if the inventor is deceased or legally incapacitated and rights were assigned to them.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

Where the deceased or legally incapacitated inventor assigned his or her rights to a party or was under an obligation to do so, and the party is named as the applicant under 37 CFR 1.46, then the 37 CFR 1.46 applicant may execute the substitute statement without the need to seek a signature from the legal representative.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureSubstitute SignatureAssignee/Applicant Signature
StatutoryRecommendedAlways
[mpep-604-e9a8dc883c2055012aced9b8]
Assignees Must Jointly Name Applicants
Note:
Where inventors assign their rights to different companies, both must be named as applicants for the patent application.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

For example, where there are two inventors, and the first inventor assigned her rights to Company X and the second inventor was under an obligation to assign his rights to Company Y, Company X and Company Y could be named as the applicant for patent in the applicant information (37 CFR 1.77(b)(7)) section of the application data sheet (PTO/AIA/14 or equivalent) and should preferably be named on filing of the application.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureJuristic Entity SignatureAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-604-ebeac9462b440b2017151ec2]
Both Companies Must Sign Patent Application
Note:
When multiple companies are applicants, both must sign the substitute statement for any inventor who refuses to execute an oath or declaration.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

Under this example, neither Company X nor Company Y could be named as the sole applicant in the application.

Jump to MPEP Source · 37 CFR 1.64(a)Assignee as Applicant SignatureJuristic Entity SignatureContent of Substitute Statement
StatutoryRequiredAlways
[mpep-604-8e684a828e2cb760e31f97de]
Assignee Must Provide Residence and Mailing Address for Substitute Statement
Note:
An assignee executing a substitute statement must provide their residence and mailing address. For juristic entities, the entity’s address and the name of the person signing are also required.

Where an assignee executes a substitute statement, the assignee must supply his/her residence and mailing address. If the assignee is a juristic entity, the residence and mailing address of the juristic entity should be used. Additionally, if the assignee is a juristic entity, the applicant name and the title of the person executing the substitute statement must be included. For a juristic entity, the substitute statement may be signed by (A) a person in the organization having apparent authority to sign on behalf of the organization (e.g., an officer), or (B) any person if the substitute statement sets forth that the person signing is authorized (or empowered) to act on behalf of the juristic entity (e.g., the general counsel). See MPEP §§ 324 and 325. Note: a power of attorney to a patent practitioner to prosecute a patent application executed by the juristic entity does not make that practitioner an official of the juristic entity or empower the practitioner to sign the substitute statement.

Jump to MPEP Source · 37 CFR 1.64Assignee as Applicant SignatureSubstitute SignaturePower of Attorney by Assignee
StatutoryRequiredAlways
[mpep-604-7255ef843519357c93f60e88]
Juristic Entity Assignee Must Provide Address and Signatory Information
Note:
If the assignee is a juristic entity, it must provide its residence and mailing address along with the applicant name and title of the person executing the substitute statement.

Where an assignee executes a substitute statement, the assignee must supply his/her residence and mailing address. If the assignee is a juristic entity, the residence and mailing address of the juristic entity should be used. Additionally, if the assignee is a juristic entity, the applicant name and the title of the person executing the substitute statement must be included. For a juristic entity, the substitute statement may be signed by (A) a person in the organization having apparent authority to sign on behalf of the organization (e.g., an officer), or (B) any person if the substitute statement sets forth that the person signing is authorized (or empowered) to act on behalf of the juristic entity (e.g., the general counsel). See MPEP §§ 324 and 325. Note: a power of attorney to a patent practitioner to prosecute a patent application executed by the juristic entity does not make that practitioner an official of the juristic entity or empower the practitioner to sign the substitute statement.

Jump to MPEP Source · 37 CFR 1.64Assignee as Applicant SignatureJuristic Entity SignatureSubstitute Signature
Topic

Substitute Statement (37 CFR 1.64)

4 rules
StatutoryRequiredAlways
[mpep-604-bba30d90cf86ef5649aa9f50]
All Parties Must Sign Substitute Statement for Non-Signing Inventor
Note:
When multiple assignees or obligated assignees are the applicant under 37 CFR 1.46, all parties must sign the substitute statement on behalf of any non-signing inventor.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

Where there are multiple assignees or obligated assignees who together are the applicant under 37 CFR 1.46, all of the parties must execute the substitute statement on behalf of the non-signing inventor.

Jump to MPEP Source · 37 CFR 1.64(a)Substitute Statement (37 CFR 1.64)Assignee as Applicant SignatureSubstitute Signature
StatutoryPermittedAlways
[mpep-604-5970b3f0984c08b69e353b9d]
Applicant Must Execute Substitute Statement
Note:
The applicant for patent must execute the substitute statement under certain circumstances, even if multiple assignees are involved.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

As stated previously, 35 U.S.C. 115(d) specifies that “the applicant for patent” may execute the substitute statement.

Jump to MPEP Source · 37 CFR 1.64(a)Substitute Statement (37 CFR 1.64)Assignee as Applicant SignatureSubstitute Signature
StatutoryRequiredAlways
[mpep-604-78c3f2b2f624a764bb786180]
Second Inventor Refusal Requires Substitute Statement
Note:
If the second inventor refuses to execute an oath or declaration, a substitute statement must be filed by appropriate officials of the applicant parties.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

If the second inventor refused to execute an oath or declaration, then a substitute statement must be filed for the second inventor.

Jump to MPEP Source · 37 CFR 1.64(a)Substitute Statement (37 CFR 1.64)Substitute SignatureInventor's Oath/Declaration Requirements
StatutoryRequiredAlways
[mpep-604-413ff8b862b71137f0ede8f1]
Appropriate Officials Must Execute Substitute Statement for Composite Applicant
Note:
The substitute statement must be signed by an official from each company that together forms the 'applicant for patent.'

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

The substitute statement must be executed by an appropriate official of Company X and an appropriate official of Company Y since together X and Y are “the applicant for patent.”

Jump to MPEP Source · 37 CFR 1.64(a)Substitute Statement (37 CFR 1.64)Assignee as Applicant SignatureJuristic Entity Signature
Topic

Substitute Signature

3 rules
StatutoryRequiredAlways
[mpep-604-61b942a95904aa16b373a9e1]
Requirements for Substitute Statement
Note:
A substitute statement must comply with specific requirements, including identifying the inventor, stating facts on information and belief, identifying the person executing it, and detailing circumstances permitting its execution.
(b) A substitute statement under this section must:
  • (1) Comply with the requirements of § 1.63(a), identifying the inventor or joint inventor with respect to whom a substitute statement in lieu of an oath or declaration is executed, and stating upon information and belief the facts which such inventor is required to state;
  • (2) Identify the person executing the substitute statement and the relationship of such person to the inventor or joint inventor with respect to whom the substitute statement is executed, and unless such information is supplied in an application data sheet in accordance with § 1.76, the residence and mailing address of the person signing the substitute statement;
  • (3) Identify the circumstances permitting the person to execute the substitute statement in lieu of an oath or declaration under § 1.63, namely whether the inventor is deceased, is under a legal incapacity, cannot be found or reached after a diligent effort was made, or has refused to execute the oath or declaration under § 1.63; and
  • (4) Unless the following information is supplied in an application data sheet in accordance with § 1.76, also identify:
    • (i) Each inventor by his or her legal name; and
    • (ii) The last known mailing address where the inventor customarily receives mail, and last known residence, if an inventor lives at a location which is different from where the inventor customarily receives mail, for each inventor who is not deceased or under a legal incapacity.
Jump to MPEP Source · 37 CFR 1.64Substitute SignatureInventor Signature RequirementsInventor Oath/Declaration Signature
StatutoryRequiredAlways
[mpep-604-d51cb5b5c0b4c150106327b4]
Inventor’s Death Not Required for Substitute Statement
Note:
A non-inventor applicant can file a substitute statement without proving the inventor's death, but must show other permitted circumstances or diligent effort to contact the inventor.

A non-inventor applicant need not submit proof of the permitted circumstance to file a substitute statement (e.g., inventor’s death certificate to establish that a named inventor is deceased). However, where the permitted circumstance identified in accordance with 37 CFR 1.64(b)(3) is other than the inventor’s death or legal incapacity, the inventor must have refused to execute the oath or declaration, or applicant must have exercised diligent effort to find or reach the inventor. Though proof is not required to be submitted to the Office, proof of attempts to secure the inventor’s signature should be kept in applicant’s file. There is no change to what is considered a good faith attempt to contact an inventor and what constitutes a refusal to sign.

Jump to MPEP Source · 37 CFR 1.64(b)(3)Substitute SignatureInventor Signature RequirementsSignature Requirements
StatutoryInformativeAlways
[mpep-604-511d30ce1ecc4513bb55a255]
No Change to Good Faith Contact and Refusal Criteria
Note:
The rule states that there is no change in what constitutes a good faith attempt to contact an inventor or a refusal to sign the oath or declaration.

A non-inventor applicant need not submit proof of the permitted circumstance to file a substitute statement (e.g., inventor’s death certificate to establish that a named inventor is deceased). However, where the permitted circumstance identified in accordance with 37 CFR 1.64(b)(3) is other than the inventor’s death or legal incapacity, the inventor must have refused to execute the oath or declaration, or applicant must have exercised diligent effort to find or reach the inventor. Though proof is not required to be submitted to the Office, proof of attempts to secure the inventor’s signature should be kept in applicant’s file. There is no change to what is considered a good faith attempt to contact an inventor and what constitutes a refusal to sign.

Jump to MPEP Source · 37 CFR 1.64(b)(3)Substitute SignatureInventor Signature RequirementsSignature Requirements
Topic

Content of Substitute Statement

3 rules
StatutoryRecommendedAlways
[mpep-604-e0be1723341536b09c19004b]
Substitute Statement for Missing Signatures
Note:
An applicant may provide a substitute statement under certain circumstances where an inventor refuses to sign or cannot be found, and multiple parties must act together as the composite entity.
35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:
  • 1. If the inventors are the applicant and one of the inventors refuses to execute the oath or declaration or cannot be found or reached, then under 37 CFR 1.45 all of the other joint inventors who are the applicant (and who executed an oath or declaration) must execute the substitute statement on behalf of the non-signing inventor. Joint inventors cannot execute a substitute statement for a deceased or legally incapacitated joint inventor.
  • 2. If the inventor is deceased or legally incapacitated, then the substitute statement may be executed by a legal representative under 37 CFR 1.43 or by the applicant under 37 CFR 1.46. Where the inventors are the applicant, only the legal representative would execute the substitute statement for the deceased or legally incapacitated inventor, and the Office would recognize the legal representative as an applicant in place of the deceased or legally incapacitated inventor. Where the deceased or legally incapacitated inventor assigned his or her rights to a party or was under an obligation to do so, and the party is named as the applicant under 37 CFR 1.46, then the 37 CFR 1.46 applicant may execute the substitute statement without the need to seek a signature from the legal representative.
  • 3. An applicant under 37 CFR 1.46 can sign under all four permitted circumstances. Where there are multiple assignees or obligated assignees who together are the applicant under 37 CFR 1.46, all of the parties must execute the substitute statement on behalf of the non-signing inventor. As stated previously, 35 U.S.C. 115(d) specifies that “the applicant for patent” may execute the substitute statement. For example, where there are two inventors, and the first inventor assigned her rights to Company X and the second inventor was under an obligation to assign his rights to Company Y, Company X and Company Y could be named as the applicant for patent in the applicant information (37 CFR 1.77(b)(7)) section of the application data sheet (PTO/AIA/14 or equivalent) and should preferably be named on filing of the application. If the second inventor refused to execute an oath or declaration, then a substitute statement must be filed for the second inventor. The substitute statement must be executed by an appropriate official of Company X and an appropriate official of Company Y since together X and Y are “the applicant for patent.” Under this example, neither Company X nor Company Y could be named as the sole applicant in the application. All parties having any portion of the ownership in the patent must act together as a composite entity in patent matters before the Office. See MPEP § 301.
Jump to MPEP Source · 37 CFR 1.64(a)Content of Substitute StatementSubstitute Statement (37 CFR 1.64)Assignee as Applicant Signature
StatutoryPermittedAlways
[mpep-604-8d9134e1243dc2ea4b21e782]
All Parties Can Sign Substitute Statement Under 37 CFR 1.46
Note:
An applicant under 37 CFR 1.46 can sign a substitute statement in lieu of an oath or declaration under all four permitted circumstances.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

An applicant under 37 CFR 1.46 can sign under all four permitted circumstances.

Jump to MPEP Source · 37 CFR 1.64(a)Content of Substitute StatementAssignee as Applicant SignatureAssignee/Applicant Signature
StatutoryRequiredAlways
[mpep-604-daebcf45ea788a786a5e13e5]
All Patent Ownership Parties Must Act Together
Note:
All parties with any portion of the patent ownership must act as a composite entity in all patent matters before the Office.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement:

All parties having any portion of the ownership in the patent must act together as a composite entity in patent matters before the Office. See MPEP § 301.

Jump to MPEP Source · 37 CFR 1.64(a)Content of Substitute StatementSubstitute Statement (37 CFR 1.64)Assignee as Applicant Signature
Topic

Power of Attorney Requirements

2 rules
StatutoryPermittedAlways
[mpep-604-0dccaa643b527afb59f8fbee]
Nonsigning Inventor Can Join Application Later
Note:
A nonsigning inventor or legal representative can join an application by submitting an oath or declaration after the initial filing, but cannot revoke or grant a power of attorney through this action.

(f) A nonsigning inventor or legal representative may subsequently join in the application by submitting an oath or declaration under § 1.63. The submission of an oath or declaration by a nonsigning inventor or legal representative in an application filed under § 1.43, 1.45 or 1.46 will not permit the nonsigning inventor or legal representative to revoke or grant a power of attorney.

Jump to MPEP Source · 37 CFR 1.63Power of Attorney RequirementsRevocation of Power of AttorneyPower of Attorney
StatutoryInformativeAlways
[mpep-604-758bf715887253b8ba16fff5]
Nonsigning Inventor Cannot Grant POA
Note:
A nonsigning inventor or legal representative cannot revoke or grant a power of attorney by submitting an oath or declaration in an application filed under §1.43, 1.45, or 1.46.

(f) A nonsigning inventor or legal representative may subsequently join in the application by submitting an oath or declaration under § 1.63. The submission of an oath or declaration by a nonsigning inventor or legal representative in an application filed under § 1.43, 1.45 or 1.46 will not permit the nonsigning inventor or legal representative to revoke or grant a power of attorney.

Jump to MPEP Source · 37 CFR 1.63Power of Attorney RequirementsRevocation of Power of AttorneyPower of Attorney
Topic

PTAB Contested Case Procedures

2 rules
StatutoryProhibitedAlways
[mpep-604-917c8cb865b36c2c6e65d386]
Inventor's Substitute Statement Requirement
Note:
An applicant may sign a substitute statement in lieu of an oath or declaration if the inventor is deceased, legally incapacitated, refuses to sign, or cannot be located after diligent effort.
37 CFR 1.64(a) provides that an applicant under 37 CFR 1.43, 1.45 or 1.46 may execute a substitute statement in lieu of an oath or declaration under 37 CFR 1.63 if the inventor is deceased, is under a legal incapacity, has refused to execute the oath or declaration under 37 CFR 1.63, or cannot be found or reached after diligent effort. Thus, the following applicant entities may sign a substitute statement on behalf of an inventor when such a statement is permitted in a patent application:
  • (i) the inventor’s legal representative under 37 CFR 1.43, where the inventor is deceased or legally incapacitated;
  • (ii) the other joint inventors under 37 CFR 1.45, where the inventor refuses to execute the oath or declaration or cannot be found or reached after diligent effort;
  • (iii) an applicant under 37 CFR 1.46 who is the assignee or party to whom the inventor is under an obligation to assign, where the inventor is deceased, legally incapacitated, refuses to execute the oath or declaration, or cannot be found or reached after diligent effort; or
  • (iv) an applicant under 37 CFR 1.46 who is a party who otherwise shows a sufficient proprietary interest in the claimed invention under 37 CFR 1.46(b), where the inventor is deceased, legally incapacitated, refuses to sign the declaration or cannot be reached or located after diligent effort.
Jump to MPEP Source · 37 CFR 1.64(a)PTAB Contested Case Procedures
StatutoryProhibitedAlways
[mpep-604-82e43e6a25c902e401854f4c]
Requirement for Substitute Statement on Deceased Inventor's Behalf
Note:
An applicant under 37 CFR 1.46 may sign a substitute statement if the inventor is deceased and shows sufficient proprietary interest in the claimed invention.

37 CFR 1.64(a) provides that an applicant under 37 CFR 1.43, 1.45 or 1.46 may execute a substitute statement in lieu of an oath or declaration under 37 CFR 1.63 if the inventor is deceased, is under a legal incapacity, has refused to execute the oath or declaration under 37 CFR 1.63, or cannot be found or reached after diligent effort. Thus, the following applicant entities may sign a substitute statement on behalf of an inventor when such a statement is permitted in a patent application:

(iv) an applicant under 37 CFR 1.46 who is a party who otherwise shows a sufficient proprietary interest in the claimed invention under 37 CFR 1.46(b), where the inventor is deceased, legally incapacitated, refuses to sign the declaration or cannot be reached or located after diligent effort.

Jump to MPEP Source · 37 CFR 1.64(a)PTAB Contested Case Procedures
Topic

Individuals Under Duty

2 rules
StatutoryProhibitedAlways
[mpep-604-0eca35cf2ce2b45343d99beb]
Non-Inventor Applicant Not Required to State Review in Substitute Statement
Note:
A non-inventor applicant does not need to state they have reviewed and understood the application contents, but must still meet disclosure requirements.

A non-inventor applicant is not required to state in the substitute statement that he/she has reviewed and understands the contents of the application, including the claims. Nevertheless, it should be noted that a person may not execute a substitute statement under 37 CFR 1.64 unless that person has reviewed and understands the contents of the application, including the claims, and is aware of the duty to disclose to the Office all information known to the person to be material to patentability as defined in 37 CFR 1.56. See 37 CFR 1.64(c). Any reference to an inventor’s oath or declaration also includes a substitute statement as provided for in 37 CFR 1.64.

Jump to MPEP Source · 37 CFR 1.64Individuals Under DutyScope of DutyMaterial Information Definition
StatutoryInformativeAlways
[mpep-604-a62e2d1fe55ea7b80942f0ff]
Substitute Statement In Lieu of Oath/Declaration
Note:
A non-inventor applicant must provide a substitute statement as required by 37 CFR 1.64, acknowledging understanding of the application contents and duty to disclose material information.

A non-inventor applicant is not required to state in the substitute statement that he/she has reviewed and understands the contents of the application, including the claims. Nevertheless, it should be noted that a person may not execute a substitute statement under 37 CFR 1.64 unless that person has reviewed and understands the contents of the application, including the claims, and is aware of the duty to disclose to the Office all information known to the person to be material to patentability as defined in 37 CFR 1.56. See 37 CFR 1.64(c). Any reference to an inventor’s oath or declaration also includes a substitute statement as provided for in 37 CFR 1.64.

Jump to MPEP Source · 37 CFR 1.64Individuals Under DutyScope of DutyMaterial Information Definition
Topic

Scope of Duty

1 rules
StatutoryProhibitedAlways
[mpep-604-9b39d58731f88363550acf65]
Person Must Review Application Before Executing Statement
Note:
A person must review and understand the application contents, including claims, and be aware of disclosure duties before executing a substitute statement.

(c) A person may not execute a substitute statement provided for in this section for an application unless that person has reviewed and understands the contents of the application, including the claims, and is aware of the duty to disclose to the Office all information known to the person to be material to patentability as defined in § 1.56.

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

AIA Effective Dates

1 rules
StatutoryInformativeAlways
[mpep-604-35ac18b64990dd63157accbf]
Requirement for Substitute Statements After September 16, 2012
Note:
This rule requires substitute statements for applications filed on or after September 16, 2012, implementing the provisions of 35 U.S.C. 115(d).

37 CFR 1.64 implements the substitute statement provisions of 35 U.S.C. 115(d) and applies to applications filed on or after September 16, 2012.

Jump to MPEP Source · 37 CFR 1.64AIA Effective DatesAIA Overview and Effective DatesAIA vs Pre-AIA Practice
Topic

Joint Applicant Signatures

1 rules
StatutoryProhibitedAlways
[mpep-604-4b09da5d7d3007346afa49c1]
Joint Inventors Cannot Execute for Deceased or Incapacitated Co-Inventor
Note:
A joint inventor cannot provide a substitute statement on behalf of a deceased or legally incapacitated co-inventor.

35 U.S.C. 115(d) provides that “the applicant for patent” may provide a substitute statement under one of the permitted circumstances. 37 CFR 1.64(a) states “an applicant” but the use of “an” is to identify alternative applicant types under 37 CFR 1.43, 1.45 or 1.46, and should not be interpreted to provide that only one or some of the parties named as the applicant may execute the substitute statement. The following examples are provided to assist applicant in execution of the substitute statement 1. If the inventors are the applicant and one of the inventors refuses to execute the oath or declaration or cannot be found or reached, then under 37 CFR 1.45 all of the other joint inventors who are the applicant (and who executed an oath or declaration) must execute the substitute statement on behalf of the non-signing inventor. Joint inventors cannot execute a substitute statement for a deceased or legally incapacitated joint inventor.

Jump to MPEP Source · 37 CFR 1.64(a)Joint Applicant SignaturesSubstitute SignatureAssignee as Applicant Signature
Topic

Signature Requirements

1 rules
StatutoryRequiredAlways
[mpep-604-913751a914e99f5f15cca1db]
Proof of Efforts to Obtain Inventor’s Signature Required for Substitute Statement
Note:
Applicants must keep records of their efforts to obtain the inventor's signature when filing a substitute statement, even if no proof is submitted to the Office.

A non-inventor applicant need not submit proof of the permitted circumstance to file a substitute statement (e.g., inventor’s death certificate to establish that a named inventor is deceased). However, where the permitted circumstance identified in accordance with 37 CFR 1.64(b)(3) is other than the inventor’s death or legal incapacity, the inventor must have refused to execute the oath or declaration, or applicant must have exercised diligent effort to find or reach the inventor. Though proof is not required to be submitted to the Office, proof of attempts to secure the inventor’s signature should be kept in applicant’s file. There is no change to what is considered a good faith attempt to contact an inventor and what constitutes a refusal to sign.

Jump to MPEP Source · 37 CFR 1.64(b)(3)Signature RequirementsSubstitute SignatureInventor Signature Requirements
Topic

Mandatory Application Elements

1 rules
StatutoryProhibitedAlways
[mpep-604-f4d512b24c68ab86c964d8e3]
Substitute Statement Requirement for Oath or Declaration
Note:
A substitute statement must identify the inventor, the person executing it, and the circumstances permitting execution.

A substitute statement under 37 CFR 1.64 must: (1) comply with the requirements of 37 CFR 1.63(a), identifying the inventor or joint inventor with respect to whom a substitute statement in lieu of an oath or declaration is executed, and stating upon information and belief the facts which such inventor is required to state; (2) identify the person executing the substitute statement and the relationship of such person to the inventor or joint inventor with respect to whom the substitute statement is executed, and unless such information is supplied in an application data sheet in accordance with 37 CFR 1.76, the residence and mailing address of the person signing the substitute statement; and (3) identify the circumstances permitting the person to execute the substitute statement, namely whether the inventor is deceased, is under a legal incapacity, cannot be found or reached after a diligent effort was made, or has refused to execute the oath or declaration under 37 CFR 1.63. For nonprovisional international design applications, the requirement in 37 CFR 1.64(b)(2) to identify the residence and mailing address of the person signing the substitute statement will be considered satisfied by the presentation of such information in the international design application prior to international registration. See 37 CFR 1.1021(d)(3).

Jump to MPEP Source · 37 CFR 1.64Mandatory Application ElementsContents of ApplicationCorrespondence Address
Topic

Hague Definitions

1 rules
StatutoryInformativeAlways
[mpep-604-3ca715c98697f4453623b15c]
Residence and Mailing Address Requirement for Substitute Statement Satisfied by International Design Application
Note:
For nonprovisional international design applications, presenting the residence and mailing address in the application before international registration satisfies the requirement to identify such information on a substitute statement.

A substitute statement under 37 CFR 1.64 must: (1) comply with the requirements of 37 CFR 1.63(a), identifying the inventor or joint inventor with respect to whom a substitute statement in lieu of an oath or declaration is executed, and stating upon information and belief the facts which such inventor is required to state; (2) identify the person executing the substitute statement and the relationship of such person to the inventor or joint inventor with respect to whom the substitute statement is executed, and unless such information is supplied in an application data sheet in accordance with 37 CFR 1.76, the residence and mailing address of the person signing the substitute statement; and (3) identify the circumstances permitting the person to execute the substitute statement, namely whether the inventor is deceased, is under a legal incapacity, cannot be found or reached after a diligent effort was made, or has refused to execute the oath or declaration under 37 CFR 1.63. For nonprovisional international design applications, the requirement in 37 CFR 1.64(b)(2) to identify the residence and mailing address of the person signing the substitute statement will be considered satisfied by the presentation of such information in the international design application prior to international registration. See 37 CFR 1.1021(d)(3).

Jump to MPEP Source · 37 CFR 1.64Hague DefinitionsContents of ApplicationCorrespondence Address
Topic

POA Form Requirements

1 rules
StatutoryPermittedAlways
[mpep-604-bd4bd95435bf2e6aad080d10]
Substitute Statement for Juristic Entity Must Be Signed by Authorized Person
Note:
A juristic entity's substitute statement must be signed by an officer with apparent authority or any person who is explicitly authorized to act on behalf of the entity.

Where an assignee executes a substitute statement, the assignee must supply his/her residence and mailing address. If the assignee is a juristic entity, the residence and mailing address of the juristic entity should be used. Additionally, if the assignee is a juristic entity, the applicant name and the title of the person executing the substitute statement must be included. For a juristic entity, the substitute statement may be signed by (A) a person in the organization having apparent authority to sign on behalf of the organization (e.g., an officer), or (B) any person if the substitute statement sets forth that the person signing is authorized (or empowered) to act on behalf of the juristic entity (e.g., the general counsel). See MPEP §§ 324 and 325. Note: a power of attorney to a patent practitioner to prosecute a patent application executed by the juristic entity does not make that practitioner an official of the juristic entity or empower the practitioner to sign the substitute statement.

Jump to MPEP Source · 37 CFR 1.64POA Form RequirementsJuristic Entity SignatureSubstitute Signature
Topic

Juristic Entity Signature

1 rules
StatutoryInformativeAlways
[mpep-604-6447c510ed46f82fc7243444]
Power of Attorney Does Not Make Practitioner an Official
Note:
A power of attorney to a patent practitioner by a juristic entity does not grant the practitioner official status or empower them to sign substitute statements.

Where an assignee executes a substitute statement, the assignee must supply his/her residence and mailing address. If the assignee is a juristic entity, the residence and mailing address of the juristic entity should be used. Additionally, if the assignee is a juristic entity, the applicant name and the title of the person executing the substitute statement must be included. For a juristic entity, the substitute statement may be signed by (A) a person in the organization having apparent authority to sign on behalf of the organization (e.g., an officer), or (B) any person if the substitute statement sets forth that the person signing is authorized (or empowered) to act on behalf of the juristic entity (e.g., the general counsel). See MPEP §§ 324 and 325. Note: a power of attorney to a patent practitioner to prosecute a patent application executed by the juristic entity does not make that practitioner an official of the juristic entity or empower the practitioner to sign the substitute statement.

Jump to MPEP Source · 37 CFR 1.64Juristic Entity SignatureSubstitute SignaturePower of Attorney Requirements
Topic

Correspondence Address

1 rules
StatutoryRequiredAlways
[mpep-604-3da2001bbec498ded4d46a61]
Inventor Legal Name and Address Required for Substitute Statement
Note:
The substitute statement must include each inventor's legal name and last known mailing address, as well as their residence if different, unless this information is provided in an application data sheet or international design application.

In addition, unless such information is supplied in an application data sheet in accordance with 37 CFR 1.76, or in an international design application prior to registration (see 37 CFR 1.1021(d)(3)), the substitute statement must also identify: (1) each inventor by his or her legal name; and (2) the last known mailing address where the inventor customarily receives mail, and last known residence, if an inventor lives at a location which is different from where the inventor customarily receives mail, for each inventor who is not deceased or under a legal incapacity.

Jump to MPEP Source · 37 CFR 1.76Correspondence AddressInventorship for International DesignsInternational Design Application Requirements

Citations

Primary topicCitation
AIA Effective Dates
Assignee as Applicant Signature
Content of Substitute Statement
Joint Applicant Signatures
Substitute Statement (37 CFR 1.64)
35 U.S.C. § 115(d)
Correspondence Address
Hague Definitions
Mandatory Application Elements
37 CFR § 1.1021(d)(3)
Assignee as Applicant Signature
Content of Substitute Statement
Joint Applicant Signatures
PTAB Contested Case Procedures
Power of Attorney Requirements
Substitute Statement (37 CFR 1.64)
37 CFR § 1.43
Assignee as Applicant Signature
Content of Substitute Statement
Joint Applicant Signatures
PTAB Contested Case Procedures
37 CFR § 1.45
Assignee as Applicant Signature
Content of Substitute Statement
PTAB Contested Case Procedures
Substitute Statement (37 CFR 1.64)
37 CFR § 1.46
PTAB Contested Case Procedures37 CFR § 1.46(b)
Individuals Under Duty
Scope of Duty
37 CFR § 1.56
Hague Definitions
Mandatory Application Elements
PTAB Contested Case Procedures
Power of Attorney Requirements
Substitute Signature
37 CFR § 1.63
Hague Definitions
Mandatory Application Elements
Substitute Signature
37 CFR § 1.63(a)
AIA Effective Dates
Hague Definitions
Individuals Under Duty
Mandatory Application Elements
37 CFR § 1.64
Assignee as Applicant Signature
Content of Substitute Statement
Joint Applicant Signatures
PTAB Contested Case Procedures
Substitute Statement (37 CFR 1.64)
37 CFR § 1.64(a)
Hague Definitions
Mandatory Application Elements
37 CFR § 1.64(b)(2)
Signature Requirements
Substitute Signature
37 CFR § 1.64(b)(3)
Individuals Under Duty37 CFR § 1.64(c)
Correspondence Address
Hague Definitions
Mandatory Application Elements
Substitute Signature
37 CFR § 1.76
Assignee as Applicant Signature
Content of Substitute Statement
Substitute Statement (37 CFR 1.64)
37 CFR § 1.77(b)(7)
Assignee as Applicant Signature
Content of Substitute Statement
Substitute Statement (37 CFR 1.64)
MPEP § 301
Assignee as Applicant Signature
Juristic Entity Signature
POA Form Requirements
MPEP § 324

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