New USPTO Rule Requires Foreign Patent Applicants to Hire U.S. Patent Counsel

On July 20, 2026, a new United States Patent and Trademark Office rule took effect that changes how foreign patent applicants interact with the agency. Under the final rule, all patent applicants and patent owners whose permanent legal residence or principal place of business is outside the United States must now be represented by a U.S.-registered patent attorney or agent in order to file, prosecute, or maintain patent applications. The rule applies to every submission received on or after the effective date, regardless of when the underlying application was originally filed. For business owners who work with international partners, co-inventors, or suppliers, the change introduces new compliance requirements that deserve immediate attention.

What the Rule Requires

Foreign-domiciled applicants and patent owners may no longer represent themselves before the USPTO on a pro se basis. Any paper submitted without the signature of a registered patent practitioner will not be entered by the agency, which means that critical filings such as responses to office actions, priority claims, and maintenance fee payments could be rejected or lost entirely. The rule defines "domicile" as the permanent legal residence of a natural person or the principal place of business of a corporate entity. There is no grandfathering provision for previously filed or pending applications, and there is no exception for issued patents that require ongoing maintenance. From the effective date forward, every foreign applicant and patent owner must have a registered U.S. patent practitioner handling their USPTO correspondence.

Why the USPTO Made This Change

The rule is not entirely new ground. On the trademark side, the USPTO has required foreign-domiciled applicants to use a U.S.-licensed attorney since 2019. The patent rule extends that same principle to patent prosecution. According to the USPTO, approximately 97 percent of foreign-origin nonprovisional patent applications already listed a U.S. practitioner of record, so the practical impact falls primarily on the small percentage of foreign applicants who had been filing without counsel. The agency cited several reasons for the change, including improving the quality and accuracy of patent filings, reducing instances of fraud and false certifications, and aligning U.S. practice with the majority of foreign patent offices that already require local representation for foreign filers.

Key Takeaway for Business Owners

For U.S. companies that collaborate with foreign co-inventors, license technology from overseas partners, or have subsidiaries abroad, this rule creates an important compliance checkpoint. If any co-applicant or patent owner on a U.S. application is domiciled outside the country, that individual or entity must now be represented by a registered U.S. patent practitioner. Failing to meet this requirement could result in rejected filings, missed deadlines, or the loss of patent rights that cannot be recovered. Business owners should review their current patent portfolios and pending applications to identify any foreign-domiciled applicants or owners who may be affected. If you work with international inventors or partners, confirm that a qualified U.S. patent attorney or agent is already in place for every application before the next filing deadline arrives.

Want to learn more about how the new USPTO representation rule may affect your patent filings? Schedule a free consultation with Diorio IP Law Group to discuss your options.