Legal analysis: Domestic patents are divided into three types: invention patents, utility model patents and design patents. Only invention patents need to pass "preliminary examination" and "substantive examination" before they can be authorized. The other two Classes only require "preliminary review" to be authorized.
Legal basis: "Patent Law of the People's Republic of China" Article 35 Within three years from the filing date of an invention patent application, the patent administration department of the State Council may, upon request submitted by the applicant at any time, The application shall be subject to substantive examination; if the applicant fails to request substantive examination within the time limit without justifiable reasons, the application shall be deemed to have been withdrawn.