The Patent Co-Operation Treaty began in 1978 and has had one of the most successful uptakes of membership of any IP Treaty (156 members at time of writing in 2022)..

Please check out our interactive PCT map at

To see how quickly countries joined the PCT bandwagon you can either click on the 'next year' button to progress through the years up to the current year or you can click the 'animate map' button.

From a few members in 1978 to most of the world today – it has been a remarkable growth.