Sec. 61 (15 U.S.C. §1141a) International applications based on United States applications or registrations 
- (a) In General.—The owner of a basic application pending before the United States Patent and Trademark Office, or the owner of a basic registration granted by the United States Patent and Trademark Office may file an international application by submitting to the United States Patent and Trademark Office a written application in such form, together with such fees, as may be prescribed by the Director.
- (b) Qualified Owners.—A qualified owner, under subsection (a) of this section, shall—
- (1) be a national of the United States;
- (2) be domiciled in the United States; or
- (3) have a real and effective industrial or commercial establishment in the United States.