1. Failing to pay the annual fee as required;
2. The patentee waives the patent right in writing;
3. When the term of patent expires, the patent right shall be terminated.
If the annual patent fee is not paid or the annual patent fee and late payment fee are not paid in full, a notice of termination of the patent right shall be issued within two months from the date of expiration, not earlier than 1 month, and the patentee shall be notified.
Where the patentee fails to start the recovery procedure or the recovery is not approved, it shall register and announce it in the patent register and patent announcement respectively four months after the termination notice is issued. After that, the patent application file is stored in the invalid file database. The expiration date of the patent right is the expiration date of the previous year.
Extended data:
Conditions for granting and accepting patent rights:
According to Article 24 of the Patent Law of People's Republic of China (PRC)
An invention-creation applying for a patent shall not lose its novelty in any of the following circumstances within six months before the date of filing:
(1) It was exhibited for the first time at an international exhibition sponsored or recognized by the China Municipal Government; ?
(2) It was first published at a specific academic conference or technical conference; ?
(3) Others disclose the contents of the application without the consent of the applicant.
Article 25
No patent right shall be granted for the following items:
(1) scientific discoveries;
(2) rules and methods of intellectual activities; ?
(3) Methods of diagnosis and treatment of diseases; ?
(4) Species of animals and plants; ?
(5) substances obtained by nuclear transformation; ?
(six) the design of the pattern, color or the combination of the two. The production method of the products listed in Item (4) of the preceding paragraph may be granted a patent right in accordance with the provisions of this Law.
Baidu Encyclopedia-Termination of Patent Right