How long does it take for the patent preliminary examination?

Legal analysis: after the patent application is submitted, you can get the patent acceptance notice in about one week, and then conduct the preliminary examination stage.

Legal basis: 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, and shall publish it within 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.