World Intellectual Property Organization

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 148 countries throughout the world. Read more about the PCT.

150 PCT Contracting States

Map of PCT contracting states

How to file your application 

Advanced PCT Seminar

Advanced PCT Seminar


Email updates

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

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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 50 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

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