Any kind of written evidence suitable for proving the transfer is admissible. This includes formal documentary proof such as the instrument of transfer itself (the original or a copy thereof) or other official documents or extracts from them, provided that they immediately verify the transfer. The signatures of the parties to the contract must appear on the documents submitted as evidence. Where the request is filed electronically with the EPO (see point 4.3.001
), the assignment document may, instead of handwritten signatures, bear qualified electronic signatures as defined in the Notice from the EPO dated 22 October 2021.
Where the original document is not in one of the EPO's three official languages, the EPO may require a certified translation in one of those languages. A declaration signed by the parties to the contract verifying the transfer is also sufficient, e.g. EPO Form 5055, which is available on the EPO website (epo.org