Authored by: Michael M. Morris and Jeremy J. Gustrowsky
The United States Patent and Trademark Office has published a final rule requiring patent applicants and patent owners who are not domiciled in the United States or its territories to be represented by a registered patent practitioner. Published in the Federal Register on March 20, 2026, the rule takes effect on July 20, 2026, and applies to all filings received on or after that date, regardless of when an application was originally filed. A “registered patent practitioner” means a registered patent attorney, registered patent agent, or an individual given limited recognition under applicable USPTO rules. The representation requirement applies to all papers submitted after initial filing, including Application Data Sheets, amendments, Information Disclosure Statements, petitions, and micro entity certifications.
The USPTO offered four main justifications for the new requirement. First, it harmonizes U.S. practice with nearly every other patent office in the world, which already requires foreign filers to use locally licensed representatives. Second, pro se (self-represented) foreign applicants consume significant USPTO resources because their applications are often not in proper form for publication or examination, slowing down processing times for everyone. Third, because registered practitioners are bound by the USPTO Rules of Professional Conduct (and subject to disciplinary action), requiring their involvement gives the Office better tools to enforce compliance with statutory and regulatory requirements. Fourth, the rule is intended to combat a rise in false micro entity certifications, fraudulent filings, and misrepresentations that the USPTO has struggled to investigate when pro se applicants simply abandon their applications.
Several practical details are worth noting. The rule defines “domicile” in new 37 CFR 1.9(p) as the permanent legal place of residence of a natural person or the principal place of business of a juristic entity. Mixed-domicile groups (some U.S., some foreign) require representation if at least one party is foreign-domiciled. The rule does not change filing date requirements. A foreign-domiciled applicant who files without a practitioner’s signature will still receive a filing date, but corrective action will be needed afterward, and the USPTO will send notices for non-compliance. However, an Application Data Sheet that is not signed by a practitioner will be treated merely as a transmittal letter, meaning inventorship will not be set and priority or benefit claims will not take effect. Certain filings that must be made at the time of original filing (such as a nonpublication request or a request for prioritized examination) could be permanently lost if not properly signed on the filing date.
From a practical standpoint, the impact appears relatively narrow. Of the roughly 296,579 foreign-origin patent applications filed in fiscal year 2022, only 1,217 (about 0.4%) were filed pro se. The USPTO estimates that 1,102 of those were small entities. The estimated legal costs for affected applicants range from roughly $3,935 to $17,600 per application, depending on complexity and whether the U.S. practitioner is providing substantive legal work or simply handling filings directed by foreign counsel. Patent practitioners and foreign applicants should begin planning now to ensure compliance when the rule takes effect on July 20, 2026.
Our firm regularly represents foreign-domiciled inventors and applicants filing patent applications in the United States, and we are well-versed in the procedural and substantive requirements that apply to overseas filers. If you or your organization will be affected by this new rule, we would welcome the opportunity to assist you. Please contact us so we can ensure your filings are handled properly and on time.
Published in the Federal Register, March 20, 2026. Effective July 20, 2026.