15 U.S. Code § 1141h - Examination of and opposition to request for extension of protection; notification of refusal
(a) Examination and opposition
(1) A request for extension of protection described in section 1141f (a) of this title shall be examined as an application for registration on the Principal Register under this chapter, and if on such examination it appears that the applicant is entitled to extension of protection under this subchapter, the Director shall cause the mark to be published in the Official Gazette of the United States Patent and Trademark Office.
(2) Subject to the provisions of subsection (c) of this section, a request for extension of protection under this subchapter shall be subject to opposition under section 1063 of this title.
(3) Extension of protection shall not be refused on the ground that the mark has not been used in commerce.
(b) Notification of refusal
If,  a request for extension of protection is refused under subsection (a) of this section, the Director shall declare in a notification of refusal (as provided in subsection (c) of this section) that the extension of protection cannot be granted, together with a statement of all grounds on which the refusal was based.
(c) Notice to International Bureau
(1) Within 18 months after the date on which the International Bureau transmits to the Patent and Trademark Office a notification of a request for extension of protection, the Director shall transmit to the International Bureau any of the following that applies to such request:
(2) If the Director has sent a notification of the possibility of opposition under paragraph (1)(C), the Director shall, if applicable, transmit to the International Bureau a notification of refusal on the basis of the opposition, together with a statement of all the grounds for the opposition, within 7 months after the beginning of the opposition period or within 1 month after the end of the opposition period, whichever is earlier.
(3) If a notification of refusal of a request for extension of protection is transmitted under paragraph (1) or (2), no grounds for refusal of such request other than those set forth in such notification may be transmitted to the International Bureau by the Director after the expiration of the time periods set forth in paragraph (1) or (2), as the case may be.
(4) If a notification specified in paragraph (1) or (2) is not sent to the International Bureau within the time period set forth in such paragraph, with respect to a request for extension of protection, the request for extension of protection shall not be refused and the Director shall issue a certificate of extension of protection pursuant to the request.
(d) Designation of agent for service of process
In responding to a notification of refusal with respect to a mark, the holder of the international registration of the mark may designate, by a document filed in the United States Patent and Trademark Office, the name and address of a person residing in the United States on whom notices or process in proceedings affecting the mark may be served. Such notices or process may be served upon the person designated by leaving with that person, or mailing to that person, a copy thereof at the address specified in the last designation filed. If the person designated cannot be found at the address given in the last designation, or if the holder does not designate by a document filed in the United States Patent and Trademark Office the name and address of a person residing in the United States for service of notices or process in proceedings affecting the mark, the notice or process may be served on the Director.
 So in original. The comma probably should not appear.