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

USPTO Final Rule — Effective July 20, 2026

A significant change is coming for foreign-domiciled inventors and companies seeking U.S. patent protection. On March 20, 2026, the U.S. Patent and Trademark Office (USPTO) published a final rule mandating that any patent applicant or patent owner whose domicile is outside the United States or its territories must be represented by a U.S.-registered patent attorney or agent when filing and prosecuting U.S. patent matters. The rule takes effect July 20, 2026.

If your company files U.S. patent applications from abroad — or if you work with foreign inventors or subsidiaries — now is the time to review your processes and ensure continuity of your patent portfolio.

What the Rule Changes

Under prior practice, foreign-domiciled applicants could file and prosecute U.S. patent applications pro se — that is, without U.S. counsel — though doing so was uncommon among sophisticated filers. The new rule closes that option entirely.

Going forward, any submission in a U.S. patent proceeding that requires practitioner representation and is not signed by a U.S.-registered patent attorney or agent will not be entered by the USPTO. The consequences of a missed or improperly filed submission can be severe, including loss of patent rights that cannot be recovered.

The USPTO’s stated rationale for the rule is threefold: to improve the quality of patent filings and examination efficiency, to reduce fraud and false certifications in the patent system, and to bring U.S. practice in line with the overwhelming majority of foreign patent offices that already require local representation.

Who Is Affected

The rule applies based on domicile, defined as:

•         For individuals (natural persons): the applicant’s permanent legal residence

•         For companies and other legal entities (juristic entities): the entity’s principal place of business

Foreign applicants who have historically relied on their own in-house staff or foreign patent agents to interface directly with the USPTO — even for limited matters — will need to route those activities through U.S.-registered counsel after July 20, 2026.

Key Practical Risks to Watch

The stakes around this rule are higher than they might initially appear. A few specific risk areas deserve close attention:

Priority claims and inventorship. A foreign applicant may still receive a filing date even without a practitioner’s signature. However, critical elements — including priority claims, inventorship designations, and micro-entity certifications — may not be recognized by the USPTO unless properly signed by a registered practitioner. A filing date without properly recognized priority or inventorship can significantly undermine the value of the resulting patent.

One-time-only filings. Certain requests must be submitted at the time of initial filing and cannot be added later. Nonpublication requests and prioritized examination requests (Track One) fall into this category. If a foreign applicant files without qualified U.S. counsel and omits these requests, the opportunity to include them may be permanently lost.

Pending applications. The rule applies not only to new applications filed on or after July 20, 2026, but also to any submission made in a pending application on or after that date. Foreign applicants with applications already in prosecution will need to ensure U.S. counsel is engaged before the effective date.

Steps to Take Now

Whether you are a foreign company managing a U.S. patent portfolio or a U.S.-based business coordinating patent filings on behalf of foreign parent companies or subsidiaries, we recommend taking the following steps before the July 20, 2026 effective date:

1.       Audit your pending U.S. applications. Identify any pending matters where the named applicant or assignee is foreign-domiciled and confirm that U.S. counsel is properly associated with each file.

2.      Review your filing workflows. If your current process allows foreign personnel or foreign agents to communicate directly with the USPTO, update that process to route all USPTO correspondence and submissions through U.S.-registered counsel.

3.      Evaluate upcoming filings. For any applications anticipated to be filed on or after July 20, 2026, ensure that U.S. counsel is engaged and in a position to sign required documents at the time of filing — including any priority claims, nonpublication requests, or examination track elections.

4.      Update agreements with foreign associates. If you work with foreign associates who coordinate U.S. filings on behalf of their clients, ensure those relationships and workflows are adjusted to comply with the new rule.

How Wood Phillips Can Help

Wood Phillips has deep experience assisting foreign applicants and multinational companies with U.S. patent prosecution, portfolio management, and strategic counseling. Our attorneys regularly work with foreign associates and international clients to coordinate U.S. filings efficiently and in compliance with USPTO requirements.

If you have questions about how this rule affects your current portfolio or upcoming filings, we invite you to contact us at 312-876-1800 or visit woodphillips.com.

This post is provided for general informational purposes and does not constitute legal advice. For advice specific to your situation, please consult an attorney. Wood Phillips is a Chicago-based intellectual property law firm dedicated exclusively to patent, trademark, and copyright matters.