Article 63 At any time before the Patent Reexamination Board makes its decision on the request for reexamination, the requesting person may withdraw his request for reexamination.
Where the requesting person withdraws his request for reexamination before the Patent Reexamination Board makes its decision, the procedure of reexamination is terminated.

Article 64 Anyone requesting invalidation or part invalidation of a patent right in accordance with the provisions of Article 45 of the Patent Law shall submit a request and the necessary evidence in two copies. The request for invalidation shall state in detail the grounds for filing the request, making reference to all the evidence as submitted, and indicate the piece of evidence on which each ground is based.
The grounds on which the request for invalidation is based, referred to in the preceding paragraph, mean that the invention-creation for which the patent right is granted does not comply with the provisions of Article 22, Article 23, or of Article 26, paragraph three or four, or of Article 33 of the Patent Law, or of Rule 2, or of Rule l3, paragraph one, or of Rule 20, paragraph one, or of Rule 21, paragraph two of these Implementing Regulations; or the invention-creation falls under the provisions of Articles 5 or 25 of the Patent Law; or the applicant is not entitled to be granted the patent right in accordance with the provisions of Article 9 of the Patent Law.

Article 65 Where the request for invalidation does not comply with the provisions of Rule 64 of these Implementing Regulations, the Patent Reexamination Board shall not accept it.
Where, after a decision on any request for invalidation of the patent right is made, invalidation based on the same facts and evidence is requested once again, the Patent Reexamination Board shall not accept it.
Where a request for invalidation of a patent for design is based on the ground that the patent for design is in conflict with a prior right of another person, but no effective ruling or judgement is submitted to prove such conflict of rights , the Patent Reexamination Board shall not accept it.
Where the request for invalidation of the patent right does not comply with the prescribed form, the person making the request shall rectify it within the time limit specified by the Patent Reexamination Board. If the rectification fails to be made within the time limit, the request for invalidation shall be deemed not to have been made.

Article 66 After a request for invalidation is accepted by the Patent Reexamination Board, the person making the request may add reasons or supplement evidence within one month from the date when the request for invalidation is filed.  Additional reasons or evidence which are submitted after the specified time limit may be disregarded by the Patent Reexamination Board.

Article 67 The Patent Reexamination Board shall send a copy of the request for invalidation of the patent right and copies of the relevant documents to the patentee and invite it or him to present its or his observations within a specified time limit.
The patentee and the person making request for invalidation shall, within the specified time limit, make responses to the notification concerning transmitted documents or the notification concerning the examination of the request for invalidation sent by the Patent Reexamination Board. Where no response is made within the specified time limit, the examination of the Patent Reexamination Board will not be affected.

Article 68 In the course of the examination of the request for invalidation, the patentee for the patent for invention or utility model concerned may amend its or his claims, but may not broaden the scope of patent protection.
The patentee for the patent for invention or utility model concerned may not amend its or his description or drawings. The patentee for the patent for design concerned may not amend its or his drawings, photographs or the brief explanation of the design.

Article 69 The Patent Reexamination Board may, at the request of the parties concerned or in accordance with the needs of the case, decide to hold an oral procedure in respect of a request for invalidation.
Where the Patent Reexamination Board decides to hold an oral procedure in respect of a request for invalidation, it shall send notifications to the parties concerned, indicating the date and place of the oral procedure to be held. The parties concerned shall make response to the notification within the specified time limit.
Where the person requesting invalidation fails to make response to the notification of the oral procedure sent by the Patent Reexamination Board within the specified time limit, and fails to take part in the oral procedure, the request for invalidation shall be deemed to have been withdrawn. Where the patentee fails to take part in the oral procedure, the Patent Reexamination Board may proceed to examine by default.

Article 70 In the course of the examination of a request for invalidation, the time limit specified by the Patent Reexamination Board shall not be extended.

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