USPTO Requires Use by Foreign Applicants and Patent Owners of a Patent PractitionerMarch 20, 2026

The United States Patent and Trademark Office (USPTO) is implementing a rule affecting foreign applicants and patent owners. The rule requires all foreign-domiciled applicants and patent owners to be represented by USPTO-registered practitioners (including attorneys and patent agents) for all matters before the USPTO. The final rule is set to be published in the Federal Register today, March 20, 2026, with an effective date of July 20, 2026.

Overview

The USPTO now requires all foreign-domiciled applicants, registrants, and parties to be represented by a USPTO-registered practitioner. This removes the ability of foreign applicants and patent owners to file matters pro se before the USPTO. This requirement applies to the filing and prosecution of patent applications, as well as to post-grant proceedings and other matters before the Office.

In practical terms, this means:

• Foreign applicants may no longer prosecute U.S. patent applications pro se or solely through non-U.S. counsel.
• A registered U.S. patent practitioner must be appointed to act on behalf of the applicant or patent owner in all USPTO matters.
• Submissions made without proper U.S. representation may not be accepted or may result in delays.

Rationale for Change

The rule change is intended to align U.S. practice with international norms and to improve the integrity and efficiency of patent prosecution. In particular, the Office has noted that the requirement:

• Treats foreign applicants and patent owners in a manner consistent with how U.S. applicants are required to proceed in many foreign jurisdictions, thereby promoting harmonization.
• Increases administrative efficiency, as the USPTO currently expends significant resources assisting pro se applicants.
• Enables more effective enforcement of statutory and regulatory requirements in patent matters.
• Enhances the USPTO’s ability to address false certifications, misrepresentations, and fraudulent filings.

Enforcement

The USPTO has made clear that compliance with this requirement will be enforced procedurally through its existing signature and entry rules. This is expected to include:

• Unsigned or improperly signed papers will not be entered into the record of the application or patent (see, e.g., MPEP § 714.01).
• Submissions such as amendments and other replies, application data sheets, information disclosure statements, and petitions will not be entered unless they are signed by a registered U.S. patent practitioner.

Failure to appoint and act through a proper USPTO-registered practitioner may result in filings being disregarded, with adverse consequences for prosecution and deadlines.

If you have any ongoing matters or upcoming filings before the USPTO, please ensure that appropriate U.S. representation—namely, USPTO-registered patent attorneys or agents—is appointed in compliance with this rule.

The proposed rule was originally published in the Federal Register on December 29, 2025, and, following the comment period, was issued as a final rule on March 20, 2026 (available here).

Questions on further implications and intricacies of the rule can be directed to members of McKee, Voorhees & Sease, PLC. Jill Link is a Partner and Chairwoman of the Firm’s Foreign Department is available at jill.link@ipmvs.com.

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