https://www.epo.org/en/node/european-0

What is the European Patent Register?

The European Patent Register (the Register) is the official place where the European Patent Office stores all publicly accessible documentation and legal status information on European patent applications and Euro-PCT patent applications as they pass through the various stages of the patent grant procedure, including opposition and certain details of the appeal procedure. Post-grant information, on the other hand, is available in the Federated Register. The European Patent Register is free of charge.