What is the duration of product patent right?

The term of invention patent right is 20 years, and the term of utility model patent right and design patent right is 10 years, counting from the date of application. After the expiration of the patent right, the patent right shall be terminated. Before the expiration of the patent right, the patentee may declare in writing that he will give up the patent right. Legal characteristics of patent right: 1. Patent right is a synthesis of personal right and property right. 2. The patent right is granted by the Patent Office. 3. The patent right is based on the disclosure of the invention. 4. The patent right can be used. If the patentee fails to exploit or does not permit others to exploit his patent, the relevant departments will take compulsory licensing measures to make full use of the patent.