On March 20, 2026, the United States Patent and Trademark Office (USPTO) published a final rule that will require all patent applicants and patent owners residing outside the U.S. to be represented by a registered U.S. patent attorney or patent agent. Basically, prosecuting a patent application “pro se” will only be available to applicants present in the U.S.
What Changes — and for Whom
The new requirement applies to all types of patent applications — utility, design, and plant — and covers both new applications filed after the effective date and any papers submitted in applications that are already pending (e.g., amendments, information disclosure statements, and other filings). The USPTO will not process submissions lacking a representative’s signature. Critically, the rule applies if even one named applicant or patent owner is foreign-domiciled.
The rule defines “domicile” to mean the permanent legal place of residence for an individual, and the principal place of business for a company. The Application Data Sheet (ADS) will serve as the starting point of inquiry, but the USPTO may investigate further if it has reason to question the information. Notably, U.S. citizens living abroad may be subject to this rule depending on the circumstances of their residence.
How Does This Affect You?
If you are an inventor or company located outside the United States — or if you work with foreign inventors or clients who file U.S. patent applications — the effective date is closer than it looks. Applications that are already in examination will need a practitioner appointment to ensure any papers that are due can be duly signed.
The practical steps are straightforward: audit your pending U.S. portfolio now to identify any application where an applicant or patent owner is domiciled outside the United States, and engage U.S. counsel promptly. Do not wait until July.
For assistance navigating this new requirement or managing your U.S. patent portfolio, contact the experienced patent attorneys at Panitch Schwarze.