Legal analysis: The patent right has a time limit, and the validity period cannot be extended.
legal basis: article 42 of the patent law of the people's Republic of China has a term of 2 years for inventions, 1 years for utility models and 15 years for designs, all of which are counted from the date of application. Where a patent right for invention is granted after four years from the date of application for a patent for invention, and three years from the date of substantive examination request, the patent administration department of the State Council shall, at the request of the patentee, compensate for the unreasonable delay of the invention patent in the process of authorization, except for the unreasonable delay caused by the applicant. In order to compensate the time occupied by the new drug listing review and approval, the patent administration department of the State Council shall compensate the patentee for the patent period of the new drug-related invention patent that has obtained the listing license in China. The compensation period shall not exceed five years, and the total effective patent right period after the new drug is approved for listing shall not exceed fourteen years.