MPEP § 213.05 — Right of Priority Based Upon an Application for an Inventor’s Certificate (Annotated Rules)

§213.05 Right of Priority Based Upon an Application for an Inventor’s Certificate

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

This page consolidates and annotates all enforceable requirements under MPEP § 213.05, 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.

Right of Priority Based Upon an Application for an Inventor’s Certificate

This section addresses Right of Priority Based Upon an Application for an Inventor’s Certificate. Primary authority: 35 U.S.C. 119(d), 37 CFR 1.55(l), and 37 CFR 1.55. Contains: 2 requirements, 2 permissions, and 2 other statements.

Key Rules

Topic

Foreign Priority Claims

8 rules
StatutoryInformativeAlways
[mpep-213-05-90d9496bb4151ccbc5e83715]
Inventor’s Certificate Priority Claim
Note:
Provisions for claiming priority to an inventor’s certificate under U.S. patent law.

37 CFR 1.55(l) contains the provisions relating to claiming priority to inventor's certificates. An inventor’s certificate may form the basis for rights of priority under 35 U.S.C. 119(d) only when the country in which it is filed gives to applicants, at their discretion, the right to apply, on the same invention, either for a patent or for an inventor’s certificate. The affidavit or declaration specified under 37 CFR 1.55(l) is only required for the purpose of ascertaining whether, in the country where the application for an inventor’s certificate originated, this option generally existed for applicants with respect to the particular subject matter of the invention involved. The requirements of 35 U.S.C. 119(d) and 37 CFR 1.55(l) are not intended, however, to probe into the eligibility of the particular applicant to exercise the option in the particular priority application involved.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryRequiredAlways
[mpep-213-05-a1baa9e2c9d8c177fa65ba8e]
Affidavit Required for Foreign Priority Based on Inventor’s Certificate
Note:
An affidavit must be provided to confirm the option generally existed in the originating country for applicants with respect to the invention's subject matter.

37 CFR 1.55(l) contains the provisions relating to claiming priority to inventor's certificates. An inventor’s certificate may form the basis for rights of priority under 35 U.S.C. 119(d) only when the country in which it is filed gives to applicants, at their discretion, the right to apply, on the same invention, either for a patent or for an inventor’s certificate. The affidavit or declaration specified under 37 CFR 1.55(l) is only required for the purpose of ascertaining whether, in the country where the application for an inventor’s certificate originated, this option generally existed for applicants with respect to the particular subject matter of the invention involved. The requirements of 35 U.S.C. 119(d) and 37 CFR 1.55(l) are not intended, however, to probe into the eligibility of the particular applicant to exercise the option in the particular priority application involved.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryInformativeAlways
[mpep-213-05-e1ae0ba1cff28804a2f0a26a]
Option Eligibility Not Probed
Note:
The requirements of 35 U.S.C. 119(d) and 37 CFR 1.55(l) do not examine an individual applicant's eligibility to exercise the priority option in a specific application.

37 CFR 1.55(l) contains the provisions relating to claiming priority to inventor's certificates. An inventor’s certificate may form the basis for rights of priority under 35 U.S.C. 119(d) only when the country in which it is filed gives to applicants, at their discretion, the right to apply, on the same invention, either for a patent or for an inventor’s certificate. The affidavit or declaration specified under 37 CFR 1.55(l) is only required for the purpose of ascertaining whether, in the country where the application for an inventor’s certificate originated, this option generally existed for applicants with respect to the particular subject matter of the invention involved. The requirements of 35 U.S.C. 119(d) and 37 CFR 1.55(l) are not intended, however, to probe into the eligibility of the particular applicant to exercise the option in the particular priority application involved.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryPermittedAlways
[mpep-213-05-701ecef98e8ae65b9fd707ca]
Inventors’ Certificates for State Employees Not Precluding US Priority
Note:
This rule permits state employees in countries that grant inventors' certificates to receive such certificates instead of patents, without affecting their right to claim priority in the United States based on these certificates.

It is recognized that certain countries that grant inventors’ certificates also provide by law that their own nationals who are employed in state enterprises may only receive inventors’ certificates and not patents on inventions made in connection with their employment. This will not impair their right to be granted priority in the United States based on the filing of the inventor’s certificate.

Jump to MPEP Source · 37 CFR 1.55Foreign Priority ClaimsPriority and Benefit Claims
StatutoryInformativeAlways
[mpep-213-05-e88e62b70b70dbf99aedbd01]
Option to Apply for Patent or Inventor’s Certificate
Note:
Applicants must show they had the option to apply for either a patent or an inventor’s certificate in their home country when claiming priority based on an inventor’s certificate application.

Accordingly, affidavits or declarations filed pursuant to 37 CFR 1.55(l) need only show that in the country in which the original inventor’s certificate was filed, applicants generally have the right to apply at their own option either for a patent or an inventor’s certificate as to the particular subject matter of the invention. Priority rights on the basis of an inventor’s certificate application will be honored only if the applicant had the option or discretion to file for either an inventor’s certificate or a patent on the invention in applicant's home country. Certain countries which grant both patents and inventor’s certificates issue only inventor’s certificates on certain subject matter, generally pharmaceuticals, foodstuffs, and cosmetics.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryInformativeAlways
[mpep-213-05-4252f257827302e02af07d60]
Inventor's Certificate Priority Option Required
Note:
An inventor must have the option to file for either a patent or an inventor’s certificate in their home country to claim priority based on an inventor’s certificate application.

Accordingly, affidavits or declarations filed pursuant to 37 CFR 1.55(l) need only show that in the country in which the original inventor’s certificate was filed, applicants generally have the right to apply at their own option either for a patent or an inventor’s certificate as to the particular subject matter of the invention. Priority rights on the basis of an inventor’s certificate application will be honored only if the applicant had the option or discretion to file for either an inventor’s certificate or a patent on the invention in applicant's home country. Certain countries which grant both patents and inventor’s certificates issue only inventor’s certificates on certain subject matter, generally pharmaceuticals, foodstuffs, and cosmetics.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryInformativeAlways
[mpep-213-05-8ee5e421c78fb62f7a5c0bf2]
Inventor’s Certificates for Certain Subject Matter
Note:
Certain countries issue only inventor’s certificates for pharmaceuticals, foodstuffs, and cosmetics, limiting the option to apply for patents or inventor’s certificates.

Accordingly, affidavits or declarations filed pursuant to 37 CFR 1.55(l) need only show that in the country in which the original inventor’s certificate was filed, applicants generally have the right to apply at their own option either for a patent or an inventor’s certificate as to the particular subject matter of the invention. Priority rights on the basis of an inventor’s certificate application will be honored only if the applicant had the option or discretion to file for either an inventor’s certificate or a patent on the invention in applicant's home country. Certain countries which grant both patents and inventor’s certificates issue only inventor’s certificates on certain subject matter, generally pharmaceuticals, foodstuffs, and cosmetics.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
StatutoryRequiredAlways
[mpep-213-05-53e23ceee6c87022a0dcb65f]
Affidavit Required for Inventor’s Certificate Priority Claim
Note:
Applicants must submit an affidavit stating they had the option to file for a patent or inventor’s certificate at the time of filing the application for an inventor’s certificate when claiming priority.

To ensure compliance with the treaty and statute, 37 CFR 1.55(l) provides that at the time of claiming priority to an inventor’s certificate, the applicant must submit an affidavit or declaration stating that the applicant when filing the application for the inventor’s certificate had the option either to file for a patent or an inventor’s certificate as to the subject matter forming the basis for the claim of priority.

Jump to MPEP Source · 37 CFR 1.55(l)Foreign Priority ClaimsPriority and Benefit Claims
Topic

Priority and Benefit Claims

1 rules
StatutoryPermittedAlways
[mpep-213-05-28c47b7b02144f58e70c98ee]
Inventor’s Certificate Priority Requirement
Note:
An inventor's certificate can serve as a priority basis under U.S. law only if the filing country allows applicants to choose between patent or certificate for the same invention.

37 CFR 1.55(l) contains the provisions relating to claiming priority to inventor's certificates. An inventor’s certificate may form the basis for rights of priority under 35 U.S.C. 119(d) only when the country in which it is filed gives to applicants, at their discretion, the right to apply, on the same invention, either for a patent or for an inventor’s certificate. The affidavit or declaration specified under 37 CFR 1.55(l) is only required for the purpose of ascertaining whether, in the country where the application for an inventor’s certificate originated, this option generally existed for applicants with respect to the particular subject matter of the invention involved. The requirements of 35 U.S.C. 119(d) and 37 CFR 1.55(l) are not intended, however, to probe into the eligibility of the particular applicant to exercise the option in the particular priority application involved.

Jump to MPEP Source · 37 CFR 1.55(l)Priority and Benefit ClaimsForeign Priority Claims

Citations

Primary topicCitation
Foreign Priority Claims
Priority and Benefit Claims
35 U.S.C. § 119(d)
Foreign Priority Claims
Priority and Benefit Claims
37 CFR § 1.55(l)

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