Beginning July 20, 2026, many foreign-domiciled patent applicants and patent owners will be required to be represented by a registered patent practitioner for patent filings and correspondence submitted to the United States Patent and Trademark Office (USPTO). The change comes from the USPTO’s final rule, “Required Use by Foreign Applicants and Patent Owners of a Patent Practitioner,” which amends the USPTO’s rules of practice to require representation by a registered patent practitioner for certain foreign-domiciled patent applicants and patent owners.
The new rule does not prevent foreign inventors, companies, universities, or other organizations from obtaining U.S. patent rights. Instead, it changes who may act directly before the USPTO when the applicant or patent owner is domiciled outside the United States or its territories.
The most important aspect of the rule is that it is based on domicile, not citizenship. As a result, the rule may affect not only foreign applicants, but also certain U.S. citizens living abroad, multinational inventor teams, startups, universities, and companies with global workforces.
Understanding whether the rule applies before filing a patent application or submitting post-filing papers can help applicants avoid unnecessary delays and procedural issues.
What Changed?
Before this rule, some foreign-domiciled inventors and applicants could file patent applications and submit papers to the USPTO without appointing a U.S. patent attorney or patent agent. Beginning July 20, 2026, that will generally no longer be permitted.
When the rule applies, filings submitted to the USPTO generally must be signed by a registered patent practitioner. This includes amendments, replies, application data sheets, information disclosure statements, petitions, and other papers filed during patent prosecution.
The rule applies to papers received by the USPTO on or after July 20, 2026, regardless of when the underlying application was filed. Therefore, even an application filed years earlier may become subject to the new requirement if a covered paper is submitted after the effective date.
A registered patent practitioner includes a registered patent attorney, a registered patent agent, and certain individuals who have been granted limited recognition to practice before the USPTO.
The USPTO adopted the rule to improve compliance with USPTO procedures, reduce improperly signed filings, and ensure that foreign-domiciled parties are represented by individuals who are subject to the USPTO’s disciplinary authority.
What Did Not Change?
The rule does not close the U.S. patent system to foreign applicants. Foreign inventors and companies may still file U.S. patent applications, obtain U.S. patents, and enforce their patent rights.
The rule also does not change the substantive requirements for patentability. Applicants must still satisfy the same requirements for obtaining patent protection, including novelty, nonobviousness, and other statutory requirements.
The rule does not change the requirements for receiving a filing date. An application filed by a foreign-domiciled applicant may still receive a filing date even if the required practitioner signature is missing. However, failing to comply with the representation requirement may create additional procedural issues that require correction.
The rule also does not impose a new requirement for maintenance-fee payments. Patent owners may continue to pay maintenance fees regardless of where they are domiciled.
Domicile, Not Citizenship
The key issue under the new rule is domicile, not citizenship.
For an individual, domicile generally means the person’s permanent legal residence. It is not necessarily determined by citizenship, nationality, passport country, temporary location, or where the person happens to be living at a particular time.
This distinction is important because a U.S. citizen may be domiciled outside the United States, while a non-U.S. citizen may be domiciled in the United States. The USPTO did not create a citizenship-based rule because it does not collect citizenship information for patent applicants and determined that verifying citizenship would create additional administrative burdens and require collection of sensitive personal information.
For companies and other organizations, domicile generally means the entity’s principal place of business rather than the country where the entity was incorporated.
Examples
The difference between citizenship and domicile may produce results that are not immediately obvious.
For example, a U.S. citizen who permanently relocates to Germany and establishes Germany as their permanent legal residence may be considered foreign-domiciled under the rule. The same could apply to a U.S. citizen who permanently moves overseas to operate a business or who retires abroad.
On the other hand, a temporary stay outside the United States does not necessarily change a person’s domicile. A U.S. citizen working overseas on a short-term assignment may remain U.S.-domiciled if the United States continues to be their permanent legal residence.
The reverse is also true. A non-U.S. citizen who has made the United States their permanent legal residence may be considered U.S.-domiciled even without becoming a U.S. citizen. For example, a Canadian citizen who permanently lives and works in Texas may be considered U.S.-domiciled and therefore may not be subject to the practitioner requirement.
Because domicile is a fact-specific inquiry, applicants should evaluate domicile carefully rather than relying only on citizenship or current location.
Mixed-Domicile Applicant Groups
The rule is particularly important for applications involving multiple inventors or applicants. Representation by a registered patent practitioner is generally required if at least one party identified as the applicant is domiciled outside the United States or its territories.
This means that the presence of a U.S.-domiciled inventor does not necessarily avoid the requirement. If a group of applicants includes even one foreign-domiciled applicant, the applicant group should expect the representation requirement to apply.
The USPTO considered whether to create an exception for mixed-domicile applicant groups but declined to do so. The USPTO explained that such an exception could undermine the purpose of the rule and create opportunities to avoid the requirement through manipulation of applicant designations.
For companies, universities, and research organizations with globally distributed teams, determining applicant status and domicile early in the filing process will be important.
Practical Filing Consequences
The new rule is more than a signature requirement. In some situations, failure to comply may affect important procedural rights.
The Application Data Sheet (ADS) deserves particular attention. If a foreign-domiciled applicant submits an ADS that requires a registered patent practitioner’s signature but is not properly signed, the USPTO will generally treat the ADS as a transmittal letter rather than giving it its intended effect.
This can have significant consequences. Inventorship may not be established through the ADS, and benefit or priority claims included in the ADS may not become effective. Correcting an ineffective priority claim may require petitions, additional fees, and delays, and in some cases the defect may not be correctable.
The USPTO has also warned that certain filing requests may not be accepted if they are improperly signed. This may include requests such as nonpublication requests or requests for prioritized examination, creating issues that cannot always be fixed after filing.
The rule also affects micro entity certifications. Although a foreign-domiciled applicant may still pay fees, a required micro entity certification generally must be signed by a registered patent practitioner when the representation requirement applies.
These consequences make it important for applicants and their counsel to address the representation requirement before filing rather than attempting to correct problems later.
Foreign applicants and their foreign patent counsel should also coordinate with U.S. patent counsel early to ensure that filing responsibilities and signature requirements are properly addressed.
Key Takeaways
The new USPTO rule does not prevent foreign inventors or companies from obtaining U.S. patent protection. It changes who may act before the USPTO when an applicant or patent owner is domiciled outside the United States or its territories.
The most important point is that domicile, not citizenship, controls. A U.S. citizen permanently living abroad may need representation by a registered patent practitioner, while a non-U.S. citizen permanently living in the United States may not.
Applicants should evaluate domicile early, confirm who will be identified as the applicant or patent owner, and ensure that required papers are properly signed when the rule applies.
For companies, universities, foreign filing counsel, and individual inventors, domicile should become part of the standard U.S. patent filing checklist. Addressing the issue at the beginning of a patent matter can help avoid filing defects, delays, and procedural problems that may be difficult or impossible to correct later.
For foreign-domiciled patent applicants and patent owners, addressing domicile, representation, and signature requirements early can help prevent filing defects, delays, and loss of procedural rights. Contact Conley Rose to discuss how your organization can prepare for the USPTO’s new registered patent practitioner requirements.