15 U.S.C. § 1141d: Request for extension of protection subsequent to international registration

The holder of an international registration that is based upon a basic application filed with the United States Patent and Trademark Office or a basic registration granted by the Patent and Trademark Office may request an extension of protection of its international registration by filing such a request—(1) directly with the International Bureau; or (2) with the United States Patent and Trademark Office for transmittal to the International Bureau, if the request is in such form, and contains such transmittal fee, as may be prescribed by the Director.