Legal analysis: the publication date of patent application is also the publication date, which refers to the date that the patent department considers that it meets the requirements of the patent law after receiving the application for invention patent, and it will be published after 18 months from the date of application. Can be announced as soon as possible at the request of the applicant. Public days are for invention patents, but there are no public days for utility models and designs. The date of authorization announcement refers to the date when the patent department makes a decision to grant a patent right, issues a patent certificate and registers the announcement at the same time. The patent right shall take effect as of the date of announcement.
Legal basis: Article 48 of the Patent Law of People's Republic of China (PRC) is under any of the following circumstances, and the the State Council Patent Administration Department may grant a compulsory license to exploit the invention patent or utility model patent upon the application of a unit or individual with implementation conditions: (1) The patentee has not exploited or fully exploited his patent for three years from the date of the grant of the patent right, and for four years from the date of the patent application, without justifiable reasons; (2) The patentee's act of exercising the patent right is recognized as a monopolistic act according to law, so as to eliminate or reduce the adverse effects of the act on competition.