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.

151 PCT Contracting States

Map of PCT contracting states

How to file your application 

Cambodia’s accession to the PCT

Cambodia’s accession to the PCT
Cambodia’s accession

Email updates

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

Sign up

How to

File your application 


Manage your application

ePCT private services provides online access to the file of your international application and a suite of functions to facilitate monitoring and managment 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 41 participating Offices providing public access, free of charge to over 58 million technology disclosures.


Questions relating to specific international applications 

Questions relating to specific international applications should preferably be uploaded through ePCT: (this may be done through ePCT public services, which does not require you to obtain a digital certificate) or sent by facsimile: +41-22 338 82 70, or you can contact the "authorized officer" directly.

General or legal questions about the PCT

Tel: +41 22 338 8338
Fax: +41 22 338 8339
E-mail: PCT Information Service

PCT Information Service

Questions about filing a PCT application at the receiving Office of the International Bureau

Tel: +41 22 338 9222
Fax: +41 22 910 0610
E-mail: PCT receiving Office

Filing directly at the RO/IB

Questions about e-filing with PCT-SAFE ePCT and DAS

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

PCT eServices

Available from Monday to Friday 9.00 am - 6.00 pm CET