(a) All payments of money required for United States Patent and Trademark Office fees, including fees for the processing of international applications (§ 1.445), shall be made in U.S. dollars and in the form of a cashier's or certified check, Treasury note, national bank notes, or United States Postal Service money order.
CFR 37-1.23-2013 history
2013CFR 37-1.23-2013 Patents, trademarks, and copyrights. Part1:Rules of practice in patent cases. Section1.23:Methods of payment.