37 CFR §2.24

1. (a)An applicant or registrant that is not domiciled in the United States may designate a domestic representative (i.e., a person residing in the United States on whom notices or process in proceedings affecting the mark may be served).
2. (b)The designation, or a request to change or revoke a designation, must set forth the name, email address, and postal address of the domestic representative and be signed pursuant to § 2.193(e)(8).
3. (c)The mere designation of a domestic representative does not authorize the person designated to represent the applicant or registrant.