If the patent proprietor states that he no longer approves the text in which the patent was granted and does not submit an amended text, the patent must be revoked. This also applies when the patent proprietor requests the patent to be revoked.
If a patent proprietor unambiguously declares to the EPO the surrender (or abandonment or renunciation) of the patent, this is interpreted as equivalent to a request that the patent be revoked (see T 237/86). If the request of the patent proprietor is not unambiguous, he is given the opportunity to request that the patent be revoked or to declare that he no longer approves of the patent being maintained as granted. This results in the patent being revoked.