USPTO Issues Final Rule on Representation Requirements for Foreign Applicants

On March 19, 2026, the United States Patent and Trademark Office (USPTO) issued a Final Rule amending the Rules of Practice in patent cases to require all patent applicants and owners who are not domiciled in the United States be represented by a practitioner in good standing registered to practice before the USPTO.[1]

This new requirement will take effect on July 18, 2026, and aligns the United States with many other jurisdictions that mandate representation by a locally registered patent agent or attorney for foreign applicants.[2]

In summarizing the Final Rule, the PTO cited several justifications for the amendment including the need to improve administrative efficiency in enforcing U.S. statutory and regulatory requirements in patent matters involving foreign parties.[3]  The USPTO also emphasized fraud mitigation as a key driver for the rule.  Specifically, the Office noted instances in which pro se foreign applicants were able to evade requests for information after potential misrepresentations were identified in their applications.[4] 

Under the new rule, requiring all foreign applicants to be represented by a registered patent practitioner ensures that the USPTO retains the ability to obtain necessary information and enforce compliance “beyond abandonment of the application.”[5]

The Final Rule, including public comments, is currently available for review in the Federal Register Reading Room and is scheduled for publication in the Federal Register on March 20, 2026. 

Going forward, inventors and patent owners who are domiciled outside the United States should consult a U.S.-registered patent attorney or agent to navigate patent prosecution requirements under this updated regulatory framework, which effectively eliminates foreign pro se participation in U.S. patent proceedings.

References

[1]              U.S. Patent & Trademark Office, Required Use by Foreign Applicants and Patent Owners of a Patent Practitioner (unpublished Final Rule, Docket No. PTO-P-2025-0008), available at https://public-inspection.federalregister.gov/2026-05564.pdf.

[2]              91 Fed. Reg. 13512 (March 20, 2026).

[3]              Id. at Section I.(C).

[4]              Id. at Section I.(D).

[5]              Id.