A new federal rule taking effect this month will reshape how inventors and companies based outside the United States pursue U.S. patent protection. Beginning July 20, 2026, any applicant or patent owner whose legal home is outside the U.S. must work through registered U.S. counsel to file or manage a patent before the U.S. Patent and Trademark Office.
According to the U.S. Patent and Trademark Office, the final rule, published in the Federal Register on March 20, 2026, requires patent applicants and patent owners whose domicile is outside the United States or its territories to be represented by a registered U.S. patent practitioner. The requirement applies to papers filed on or after July 20, 2026, regardless of when the underlying application was filed or when the patent was issued.
The change brings U.S. practice in line with most major patent offices, including those in Europe and Japan, which already require foreign filers to use locally authorized representatives. The USPTO has also cited administrative efficiency and a rise in fraudulent filings and false fee certifications as reasons for the rule.
Notably, "foreign" is defined by domicile—an individual's permanent legal residence or an entity's principal place of business—not citizenship or mailing address, so even a single foreign-domiciled co-inventor can trigger the requirement for an entire application.
Sorting out how the rule applies to a given portfolio is not always obvious. Several points stand out: Any patent applicant or owner domiciled outside the U.S. or its territories must now act through a USPTO-registered patent attorney or agent. The rule covers utility, design, and plant patents, and reaches filings across the life of a matter: amendments, information disclosure statements, petitions, responses to Office actions, reissues, and post-grant proceedings. A single foreign-domiciled inventor, applicant, or owner triggers the requirement for the entire application, even when other parties are U.S.-based.
The rule does not change the requirements for obtaining a filing date, but an Application Data Sheet not signed by a registered practitioner may be treated as a mere transmittal, meaning inventorship is not established and priority claims may not take effect. Certain requests that must be made at the time of filing, such as a nonpublication request or a request for prioritized examination, can be permanently lost if they are not properly signed.
Because the requirement applies based on the date a paper is submitted, it reaches pending applications and issued patents, not just new filings.
"For a lot of overseas inventors, this rule changes the mechanics of protecting an idea in the United States, and the deadlines don't wait for anyone to catch up," said J. Baron Lesperance, founder of The Patent Baron, PLLC, an intellectual property firm in Brighton, MI. "With an engineering background and years spent managing patents across Europe, Asia, and the Americas, we're used to bridging that gap for international clients. We're here to make sure a missed signature never costs someone their priority date or their rights."
