What conditions do you need to apply for a patent to sue the expressway?

China's application to participate in PPH mechanism should meet the following conditions: the date of PPH request should be after the application enters the substantive examination stage and before the substantive examination begins. Among them, for the application for approval, the applicant has at most two opportunities to make PPH requests, and the applicant can make PPH requests at the same time after the application is published in China.