Can a patent be converted into a valid patent without paying the annual patent fee?

Failure to pay the annual patent fee will result in late fees or recovery fees, which will eventually lead to the invalidation of the patent right.

As long as the fee is not paid before the patent expires, the right can be restored.

Failing to pay the patent standard annual fee, late payment fee and recovery right request fee within 2 and a half months after receiving the patent termination notice.

Then the patent right will be terminated and invalid because the annual fee has not been paid, and it will become a "public patent" completely.

Expired patents cannot be converted.