The protection period of an invention patent is 20 years. If the invention patentee fails to pay the annual fee of the invention patent or give up his patent right in writing in accordance with the provisions, the patent right shall be terminated before the expiration of the time limit.
Legal objectivity:
Article 28 of the Patent Law of People's Republic of China (PRC) The date when the patent administrative department of the State Council receives the patent application documents shall be the filing date. If the application documents are mailed, the postmark date of mailing shall be the application date. Article 29 of the Patent Law of People's Republic of China (PRC) Where an applicant applies for a patent for invention or utility model for the first time in a foreign country within 12 months, or applies for a patent for design for the first time in a foreign country within 6 months, and applies for a patent on the same subject in China, he may enjoy the priority according to the agreement signed by the foreign country with China or the international treaty to which * * * is a party, or according to the principle of mutual recognition of priority. Applicants who file a patent application for invention or utility model for the first time in China within 12 months, or apply for a patent for design for the first time in China within 6 months may enjoy priority.