About us Legal foundations and member statesOverview Main navigation Legal foundations Member states Extension states Validation states https://www.epo.org/en/node/foundation Home About us Legal foundations and member states Legal foundations and member states Legal foundations The basis upon which the European Patent Organisation was set up. Read more Member states States which are currently members of the European Patent Organisation. Read more Extension states States with which the European Patent Organisation has signed an extension agreement. Read more Validation states States with which the European Patent Organisation has signed a validation agreement. Read more The 39 member states of the EPO (dark red), also including one extension state (dark grey) and four validation states (blue).