Legal analysis: If the patentee finds that the reasons given by others are invalid and the evidence provided is untrue and insufficient, the patentee may start to prepare a statement of defense opinions and request the Patent Office to reject the invalid request. When the patentee receives a copy of the patent invalidation document submitted by others from the China Patent Office, he shall carefully read and analyze the main reasons for the invalidation of the patent proposed by others, and prepare and write a defense accordingly. The patentee analyzes the essential difference between his claim and the existing technology, and then determines whether the reasons put forward by the other party are valid or not, and whether it will undermine the patentability of this patent.
Legal basis: Article 41 of the Patent Law of People's Republic of China (PRC). If the patent applicant refuses to accept the decision of the patent administration department in the State Council to reject the application, he may request a reexamination to the patent administration department in the State Council within three months from the date of receiving the notice. After the review, the patent administration department in the State Council shall make a decision and notify the patent applicant. If the patent applicant refuses to accept the reexamination decision of the patent administrative department of the State Council, he may bring a lawsuit to the people's court within three months from the date of receiving the notice.