Logo of WIPO PCT, the international patent system

PCT – The International Patent System

The Patent Cooperation Treaty (PCT) assists applicants in seeking patent protection internationally for their inventions, helps patent Offices with their patent granting decisions, and facilitates public access to a wealth of technical information relating to those inventions. By filing one international patent application under the PCT, applicants can simultaneously seek protection for an invention in a very large number of countries. Read more about the PCT.

153 PCT Contracting States

Map of PCT contracting states

Email updates

PCT Newsletter – News and information for users of the PCT System, including fee tables and seminars. Monthly.

Sign up
New:  Because the fax services of the International Bureau, including as receiving Office, will be discontinued during 2019, a new PDF document upload service has been made available; this service will also be available in the unlikely event that ePCT is not available:  Contingency Upload Service (further information).

How to

File your application 


Manage your application

ePCT with strong authentication provides online access to the file of your international application and a suite of functions to facilitate monitoring and management during the international phase.

Search published applications

Published international applications are available on PATENTSCOPE, one of WIPO's global databases.  This database also includes patent documents from 57 participating Offices providing public access, free of charge to over 74 million technology disclosures.


For questions related to:

Your specific PCT application

Contact your “authorized officer”.

Through ePCT (WIPO IP Portal) (with or without strong authentication)

Through Contingency Upload Service (FAQs)

Fax: +41 22 338 82 70
(will be discontinued in 2019)

PCT general or legal matters

E-mail: PCT Information Service
Tel: +41 22 338 8338
Fax: +41 22 338 8339
(will be discontinued in 2019)

More about the PCT Information Service

Filing a PCT application at the receiving Office of the International Bureau

E-mail: PCT Receiving Office
Tel: +41 22 338 9222
Fax: +41 22 910 0610
(will be discontinued in 2019)

More about filing a PCT application directly at the RO/IB; including through Contingency Upload Service (FAQs)

E-filing with ePCT and PCT-SAFE and Contingency Upload Service 

E-mail: PCT eServices
Tel: +41 22 338 9523

More about PCT eServices, ePCT (WIPO IP Portal)PCT-SAFE, Contingency Upload Service (FAQs) and DAS

Available from Monday to Friday 9.00 am - 6.00 pm CET