Legal analysis: China's patent law stipulates that the term of invention patent right is 20 years, and the term of utility model patent right and design patent right is 10 years, all of which are counted from the date of application. The first day of the semester (start date) is not included in the entrance period. If calculated in years or months, the expiration date shall be the corresponding day of the last month; If there is no corresponding day in the current month, the last day of the current month shall be the due date.
Legal basis: Article 42 of the Patent Law of People's Republic of China (PRC) has a term of 20 years, and the term of utility model patent and design patent is 10 years, counting from the date of filing.