What is the reason for the termination of patent right?

Legal analysis: Reasons for the termination of patent right: (1) Failure to pay the annual fee as required; (2) The patentee waives the patent right in writing; 3) The patent right expires.

Legal basis: People's Republic of China (PRC) Patent Law.

Article 42 The term of patent right for invention is 20 years, and the term of patent right for utility model and patent right for design is 10 years, counting from the date of application.

Article 47 An invalid patent right shall be regarded as nonexistent from the beginning.