Legal basis: According to Article 42 of the Patent Law of People's Republic of China (PRC), the term of invention patent is 20 years, and the term of utility model patent and design patent is+years, counting from the date of filing. Article 43 of the Patent Law of People's Republic of China (PRC) stipulates that the patentee shall pay the annual fee from the year when the patent right is granted. Article 44 of the Patent Law of People's Republic of China (PRC) stipulates that the patent right shall be terminated before the expiration of the time limit under any of the following circumstances: (1) failing to pay the annual fee as required; (2) Where the patentee waives his patent right in writing and 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.