35 U.S.C. 293 Nonresident patentee; service and notice.
Every patentee not residing in the United States may file in the Patent and Trademark Office a written designation stating the name and address of a person residing within the United States on whom may be served process or notice of proceedings affecting the patent or rights thereunder. If the person designated cannot be found at the address given in the last designation, or if no person has been designated, the United States District Court for the Eastern District of Virginia shall have jurisdiction and summons shall be served by publication or otherwise as the court directs. The court shall have the same jurisdiction to take any action respecting the patent or rights thereunder that it would have if the patentee were personally within the jurisdiction of the court.
37 CFR 3.61 Domestic representative.
If the assignee of a patent, patent application, trademark application or trademark registration is not domiciled in the United States, the assignee may designate a domestic representative in a document filed in the United States Patent and Trademark Office. The designation should state the name and address of a person residing within the United States on whom may be served process or notice of proceedings affecting the application, patent or registration or rights thereunder.
An assignee of a patent or patent application who is not domiciled in the United States may, by written document signed by such assignee, designate a domestic representative. The designation of domestic representative should always be a paper separate from any assignment document, in order that the paper of designation can be retained in the appropriate application or patent file. Also, there should be a separate paper of designation of representative for each patent or application, so that a designation paper can be placed in each file. The designation of a domestic representative should be directed to the Office of Public Records for processing.