After the invention patent application is published, if the applicant has submitted a substantive examination request and it has taken effect, the applicant will enter the substantive examination procedure. If a substantive examination request has not been filed before, it must be filed within the prescribed time limit and the substantive examination fee must be paid. If the applicant has not submitted a request for substantive examination within three years from the date of application, or the request for substantive examination has not taken effect, the application will be deemed to have been withdrawn.