legal ground
Rule 66 of the Implementing Rules of the Patent Law
Where the request for invalidation of the patent right does not conform to the first paragraph of Article 19 of the Patent Law or the provisions of Article 65 of these Rules, the Patent Reexamination Board shall not accept it.
After the Patent Reexamination Board makes a decision on the request for invalidation, the Patent Reexamination Board refuses to accept the request for invalidation on the same grounds and evidence.
Where a request for invalidation of the patent right for a design is made on the grounds that it does not conform to the third paragraph of Article 23 of the Patent Law, but no evidence to prove the conflict of rights is submitted, the Patent Reexamination Board shall not accept it.
If the request for invalidation of the patent right does not conform to the prescribed format, the claimant for invalidation shall make corrections within the time limit specified by the Patent Reexamination Board; If no correction is made at the expiration of the time limit, the request for invalidation shall be deemed not to have been made.