Legal analysis: There are two kinds of termination of patent right: 1, which is terminated due to the expiration of the protection period. In other words, the patent expires because of its protection period. 2. The patent right shall be terminated before the expiration of the protection period. (1) Before the expiration of the patent protection period, the patentee renounced the patent right in written form to the patent administration department of the State Council. According to the Patent Law, if the patentee waives the patent right in writing, the patent right shall be terminated before the expiration of the time limit. 2) During the period of patent protection, the patentee fails to pay the annual fee according to law. The patent law stipulates that if the annual fee is not paid according to law, the patent right shall be terminated before the expiration of the time limit.
Legal basis: Article 44 of the Patent Law of People's Republic of China (PRC) is subject to any of the following circumstances: (1) Failure to pay the annual fee as required; (2) The patentee waives his patent right in writing. Where the patent right is terminated before the expiration of the time limit, it shall be registered and announced by the patent administration department of the State Council.