MPEP § 409.03(c) — Unavailable Legal Representative of Deceased Inventor (Annotated Rules)

§409.03(c) Unavailable Legal Representative of Deceased Inventor

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

This page consolidates and annotates all enforceable requirements under MPEP § 409.03(c), 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.

Unavailable Legal Representative of Deceased Inventor

This section addresses Unavailable Legal Representative of Deceased Inventor. Primary authority: 35 U.S.C. 117, 37 CFR 1.47, and 37 CFR 1.42. Contains: 1 requirement, 2 prohibitions, and 1 other statement.

Key Rules

Topic

AIA Definition of Applicant (37 CFR 1.42)

4 rules
StatutoryProhibitedAlways
[mpep-409-03-c-60b0a0d9affbb5d9b217d303]
Requirement for Deceased Inventor's Legal Representative
Note:
The rule requires that the last known address of a legal representative must be provided if they cannot be found or reached after diligent effort.

Pre-AIA 37 CFR 1.47 should not be considered an alternative to pre-AIA 37 CFR 1.42 or pre-AIA 35 U.S.C. 117 since the language “cannot be found or reached after diligent effort” has no reasonable application to a deceased inventor. In re Application Papers Filed September 10, 1954, 108 USPQ 340 (Comm’r Pat. 1955). See pre-AIA 37 CFR 1.42 and MPEP § 409.01. However, pre-AIA 37 CFR 1.47 does apply where a known legal representative of a deceased inventor cannot be found or reached after diligent effort, or refuses to make application. In such cases, the last known address of the legal representative must be given (see MPEP § 409.03(e)).

Jump to MPEP Source · 37 CFR 1.47AIA Definition of Applicant (37 CFR 1.42)Applicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-409-03-c-c88afdae0502f9484e68a9b2]
Requirement for Legal Representative of Deceased Inventor
Note:
The legal representative of a deceased inventor must be found or reached after diligent effort before applying. If not, the last known address must be provided.

Pre-AIA 37 CFR 1.47 should not be considered an alternative to pre-AIA 37 CFR 1.42 or pre-AIA 35 U.S.C. 117 since the language “cannot be found or reached after diligent effort” has no reasonable application to a deceased inventor. In re Application Papers Filed September 10, 1954, 108 USPQ 340 (Comm’r Pat. 1955). See pre-AIA 37 CFR 1.42 and MPEP § 409.01. However, pre-AIA 37 CFR 1.47 does apply where a known legal representative of a deceased inventor cannot be found or reached after diligent effort, or refuses to make application. In such cases, the last known address of the legal representative must be given (see MPEP § 409.03(e)).

Jump to MPEP Source · 37 CFR 1.47AIA Definition of Applicant (37 CFR 1.42)Applicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryProhibitedAlways
[mpep-409-03-c-e78884058737ea5df182e40b]
Legal Representative Required for Deceased Inventor
Note:
Where a known legal representative of a deceased inventor cannot be found or reached after diligent effort, or refuses to make application, pre-AIA 37 CFR 1.47 applies.

Pre-AIA 37 CFR 1.47 should not be considered an alternative to pre-AIA 37 CFR 1.42 or pre-AIA 35 U.S.C. 117 since the language “cannot be found or reached after diligent effort” has no reasonable application to a deceased inventor. In re Application Papers Filed September 10, 1954, 108 USPQ 340 (Comm’r Pat. 1955). See pre-AIA 37 CFR 1.42 and MPEP § 409.01. However, pre-AIA 37 CFR 1.47 does apply where a known legal representative of a deceased inventor cannot be found or reached after diligent effort, or refuses to make application. In such cases, the last known address of the legal representative must be given (see MPEP § 409.03(e)).

Jump to MPEP Source · 37 CFR 1.47AIA Definition of Applicant (37 CFR 1.42)Applicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice
StatutoryRequiredAlways
[mpep-409-03-c-c3d8612bc5f0c5dafd910254]
Legal Representative’s Last Known Address Must Be Given
Note:
When a legal representative of a deceased inventor cannot be found, reached, or refuses to make application, their last known address must be provided.

Pre-AIA 37 CFR 1.47 should not be considered an alternative to pre-AIA 37 CFR 1.42 or pre-AIA 35 U.S.C. 117 since the language “cannot be found or reached after diligent effort” has no reasonable application to a deceased inventor. In re Application Papers Filed September 10, 1954, 108 USPQ 340 (Comm’r Pat. 1955). See pre-AIA 37 CFR 1.42 and MPEP § 409.01. However, pre-AIA 37 CFR 1.47 does apply where a known legal representative of a deceased inventor cannot be found or reached after diligent effort, or refuses to make application. In such cases, the last known address of the legal representative must be given (see MPEP § 409.03(e)).

Jump to MPEP Source · 37 CFR 1.47AIA Definition of Applicant (37 CFR 1.42)Applicant and Assignee Filing Under AIAAIA vs Pre-AIA Practice

Citations

Primary topicCitation
AIA Definition of Applicant (37 CFR 1.42)35 U.S.C. § 117
AIA Definition of Applicant (37 CFR 1.42)37 CFR § 1.42
AIA Definition of Applicant (37 CFR 1.42)37 CFR § 1.47
AIA Definition of Applicant (37 CFR 1.42)MPEP § 409.01
AIA Definition of Applicant (37 CFR 1.42)MPEP § 409.03(e)

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