Can I apply for an extension of the invention patent myself?

The term of the invention patent right cannot be extended. According to relevant laws and regulations, the term of utility model patent is 10 years, design patent is 15 years and invention patent is 20 years. Moreover, the aforementioned patent shall expire at the expiration of the time limit and shall not be extended.

legal ground

Article 42 of the Patent Law of People's Republic of China (PRC)

The term of patent right for invention is 20 years, the term of patent right for utility model is 10 year, and the term of patent right for design is 15 year, all of which are counted from the date of application.

Article 43

The patentee shall pay the annual fee from the year when the patent right is granted.

Article 44

In any of the following circumstances, the patent right shall be terminated before the expiration of the time limit:

(a) failing to pay the annual fee in accordance with the provisions;

(2) The patentee waives his patent right in writing.

Where 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.