The calculation method of the authorization date of the invention patent is: after the invention patent has passed the preliminary examination and substantive examination, the date of registration and announcement is the authorization date. After the initial examination by the patent administrative department of the State Council, the patent application shall be published within 18 months from the date of application. The applicant shall, within three years from the date of application, apply to the relevant departments for substantive examination, and after the examination is passed, the patent shall be granted and registered. This date is the authorization date.
legal ground
Article 34 of the Patent Law of People's Republic of China (PRC) * * * After receiving an application for a patent for invention, the administrative department for patent in the State Council, after preliminary examination, finds that it conforms to the provisions of this Law, shall immediately publish it after 18 months from the date of application. The patent administration department of the State Council may publish its application at an early date upon the request of the applicant.