According to the art. 63 par. 1 of the European Patent Convention (EPC) , the term of the European patent shall be 20 years from the date of filing of the application.
Nothing in the mentioned paragraph shall limit the right of a Contracting State to extend the term of a European patent, or to grant corresponding protection which follows immediately on expiry of the term of the patent, under the same conditions as those applying to national patents:
(a)
in order to take account of a state of war or similar emergency conditions affecting that State;