1, the actual trial is the substantive examination. The substantive examination procedure of an application for a patent for invention is initiated mainly based on the applicant's request for substantive examination. In order to start the substantive examination procedure, the applicant shall make a formal substantive examination request within 3 years from the date of filing or priority in China. If no substantive examination is requested during this period, the application will be deemed to be withdrawn.
2. According to the Patent Law, the examination and approval procedure of an application for a patent for invention is divided into five stages: acceptance, preliminary examination, publication, substantive examination and authorization.