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

What is the Federated Register?

The Federated Register is a service in the EP Register that provides data on the legal status of an EP patent document in the national phase, also known as the post-grant phase. The Federated Register panel displays – in a single overview – the legal status of a patent in the designated contracting and extension states offering the service during the national phase. If validation states have been designated, they are listed in the section National patent registers below the overview. Most country codes have deep links to the corresponding record in the national patent register so you can access the legal status information at source for legal certainty. The Federated Register is a significant legal source of information for patent professionals such as patent attorneys, IP consultants and industry representatives.