What is the use of the announcement of the application for a patent for invention and the notice of examination at the substantive stage?

Legal analysis: the notice of the application for a patent for invention entering the substantive examination stage is the intermediate document of the application for a patent for invention, indicating the present stage of the invention patent; The time limit for filing a request for substantive examination of a patent for invention is three years from the date of application. If it is not mentioned within this time limit, it shall be deemed to have been withdrawn and the patent application shall be invalid.

Legal basis: People's Republic of China (PRC) Patent Law.

Article 34 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, and shall publish it after 18 months from the date of filing.

Article 39 If the application for a patent for invention is not found to be rejected after substantive examination, the administrative department for patent in the State Council shall make a decision to grant a patent right for invention, issue a patent certificate for invention, and register and announce it at the same time. The invention patent right shall take effect as of the date of announcement.