Legal analysis: Generally speaking, it takes about three years to apply for a patent for an invention. Invention patents will generally be published after the date of filing 18. If a real test is put forward after it is made public, it usually takes two levels to authorize it, which takes more than two years. In short, it depends on the specific case and the examiner. The law does not limit the examination time, but only the applicant's defense time. You can also apply publicly in advance for a real trial, which will be faster, but the authorization will not be earlier than 18 months at the earliest. Even if the internal audit is completed within 18 months, the authorization will wait until 18 months, because the problem of application conflict will be considered.
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.