Patent Cooperation Treaty Helpdesk

The Patent Cooperation Treaty (PCT) is an international agreement among intellectual property offices and intergovernmental authorities regarding the process of international patent applications. Please contact the PCT Helpdesk at 571-272-4300 (local) for questions and information concerning the PCT and filing a PCT application. Assistance is available Monday through Friday (except federal holidays) from 8:30 a.m. to 5 p.m. ET.

Additionally, any general PCT related inquires which are NOT case-specific or time-sensitive may be emailed to  This email address has been established on a one-year pilot basis effective January 1, 2022.  See Establishment of a USPTO Email Box for Submitting General Questions Related to the Patent Cooperation Treaty and Applications Filed or Submitted Thereunder, 1493 OG 212 (December 7, 2021).