Extension, designation and validation states of a European patent

Date of entrance and applicability of the accession of new member states to the EPC since 2000


European Patent

Only European patent applications filed on or after the date of entry into force may designate the new member states.

No retroactive designation is possible.


Only PCT applications filed on or after the date of entrance, which designate European Patent, will include the new EPC contracting states.

Extensions states

It has to be noted that SI, RO, HR and MK were extension states.

The extension system will continue to apply to all EP and PCT applications filed prior the date of entrance with regard to these states.