The U.S. Patent and Trademark Office (USPTO) has issued a final rule requiring patent applicants and patent owners whose domicile is outside the United States or its territories to be represented by a U.S.-registered patent attorney or agent in order to file and prosecute U.S. patent matters. This rule amends the USPTO’s Rules of Practice in Patent Cases and formalizes a requirement that had previously been proposed in late 2025.

What Changed
Under the final rule, foreign‑domiciled applicants and patent owners may no longer file, prosecute, or maintain U.S. patent applications on a pro se basis. Any submission that requires representation and is not signed by a registered patent practitioner will not be entered by the USPTO, potentially jeopardizing U.S. patent rights.

The USPTO adopted this rule to:

• Improve filing quality and examination efficiency
• Reduce fraud and false certifications
• Align U.S. patent practice with the overwhelming majority of foreign patent offices that already require local representation

When the Rule Takes Effect
The final rule becomes effective July 20, 2026 (120 days after publication in the Federal Register). It will apply to:

• All new patent applications filed on or after the effective date, and
• All submissions made in pending applications on or after the effective date

Key Practical Considerations

• A foreign‑domiciled applicant may still receive a filing date without a practitioner signature, but critical elements – such as priority claims, inventorship, and micro‑entity certifications – may not be recognized unless properly signed by a registered practitioner.
• Certain filings that must be made at the time of filing (e.g., nonpublication requests or prioritized examination requests) may be permanently lost if not submitted correctly.
• The rule applies based on an applicant’s domicile, defined as a natural person’s permanent legal residence or a juristic entity’s principal place of business.

How We Can Help
The attorneys in Barley Snyder’s Intellectual Property Practice Group regularly assist foreign applicants and multinational companies with U.S. patent strategy, compliance, and prosecution. If you have questions about how this final rule may affect your current or future filings, please contact partner Joseph Falcon or any member of our Intellectual Property Practice Group