USPTO mandates that all foreign-domiciled patent applicants be represented by a licensed U.S. patent practitioner: Effective July 20, 2026

The United States Patent and Trademark Office (USPTO) has issued a final rule requiring patent applicants and patent owners whose domicile is not located within the United States or its territories to be represented by a USPTO-registered patent practitioner. The rule takes effect 120 days after its publication in the Federal Register on March 20, 2026 (that is, July 20, 2026) and applies to all filings received on or after the effective date.

📌 Key Points

• Applicable Parties: Patent applicants and patent owners domiciled outside the United States or its territories

• Requirement: Mandatory appointment of a USPTO-registered Patent Practitioner (registered patent attorney or registered patent agent)

• Regulatory Basis: Amendments to 37 CFR §§ 1.9, 1.31, 1.32, and 1.33

• Effective date: July 20, 2026 (120 days after Federal Register publication on March 20, 2026)

• Applicable Filings: All filings submitted on or after the effective date

📌 Key Regulatory Changes (37 CFR Amendments)

• § 1.9 — New definition of "domicile": The term "domicile" is defined as the permanent legal place of residence of a natural person, or the principal place of business of a juristic entity.

• § 1.31 — Mandatory representation requirement: Representation by a USPTO-registered patent practitioner is now required in the following three situations: (1) where the applicant or patent owner is a juristic entity (e.g., a corporation); (2) where at least one party identified as the applicant has a domicile outside the United States or its territories; and (3) where at least one party identified as the patent owner has a domicile outside the United States or its territories. Powers of attorney must be signed by all parties identified as the applicant or patent owner to be effective.

• § 1.32 — Definition of "patent practitioner": A formal definition of "patent practitioner" is added to the regulations.

• § 1.33 — Signature requirements: All amendments and other papers filed on behalf of a juristic entity applicant, a foreign-domiciled applicant, or a foreign-domiciled patent owner must be signed by a registered patent practitioner. Documents that are required to be signed by a specific party, such as the inventor's oath or declaration under 37 CFR 1.63, are excluded from this requirement.

📌 Background: Four Justifications Offered by the USPTO

The USPTO provided the following four primary reasons for adopting this rule:

1. Harmonization with international practice: Nearly every patent office around the world already requires foreign applicants to be represented by a locally licensed or registered practitioner. This rule brings U.S. practice in line with that global standard.

2. Increased examination efficiency: Pro se filings by foreign applicants frequently fail to meet the formal conditions required for publication and examination. This places an additional processing burden on the Office of Patent Application Processing (OPAP) and requires patent examiners to spend extra time on procedural matters, thereby increasing overall patent application pendency.

3. Enhanced compliance with statutory and regulatory requirements: Registered patent practitioners are subject to the USPTO Rules of Professional Conduct and may face disciplinary sanctions for violations, including a duty to cooperate with inquiries and investigations. As false micro entity certifications and other fraudulent filings have been on the rise, the practitioner signature requirement serves as a meaningful deterrent.

4. Fraud mitigation and protection of patent system integrity: When a pro se foreign applicant abandons an application, the USPTO’s ability to investigate false certifications or misrepresentations is effectively terminated. Requiring a registered patent practitioner of record preserves the USPTO’s investigative reach beyond the point of abandonment.

📌 Important Practical Notes

This rule does not change the requirements for obtaining a filing date. A foreign-domiciled applicant who files without a practitioner’s signature will still be accorded a filing date under 37 CFR 1.53, but corrective action will be required thereafter.

U.S. citizenship is not an exception to this requirement. The rule is based on domicile, not nationality. Likewise, no exception applies to mixed-domicile applicant groups, even where only one of several applicants has a foreign domicile, a registered patent practitioner must be appointed. Provisional applications are also not exempt, though the practical impact is limited since filing dates are preserved; practitioner involvement is required for any follow-on petitions or filings within the provisional application.

📌 Comparison with Trademark Practice

The trademark side of the USPTO has operated under an equivalent requirement since 2019. Since August 3, 2019, all individuals and entities domiciled outside the United States must be represented by a U.S.-licensed attorney in all trademark matters before the USPTO, and every official submission must be prepared, signed, and filed by an attorney licensed to practice law in the United States.

📌 Action Points for Foreign Applicants and Practitioners

This rule applies to all submissions filed on or after the effective date, regardless of when the underlying application was originally filed. Accordingly, even currently pending applications filed before July 20, 2026 will require a registered patent practitioner’s signature on any amendments, office action responses, petitions, and other correspondence submitted on or after that date.

Foreign applicants, including individuals and companies, and foreign patent law firms are strongly advised to begin establishing a working relationship with a reliable USPTO-registered patent practitioner now, well in advance of the July 20, 2026 effective date.