(1) Without the right of refusal, the patentee shall not refuse other socialist public units to use their patented inventions; (2) Priority in the use of patented inventions; (3) The relevant patents specially used for scientific research and experiments are not regarded as infringement of foreign temporary transit vehicles, and the use of relevant patents in their devices and equipment for the needs of vehicles is not regarded as infringement of patent rights; (4) Compulsory license. If, within three years from the date when the patent right for invention or utility model is granted, the patentee fails to exploit or fully exploit the invention without justifiable reasons, the Patent Office may, upon the application of a unit that meets the requirements for exploitation, allow the unit to exploit its invention without the consent of the patentee, and the unit that has obtained the compulsory license shall still pay the royalties to the patentee; (5) If the invention patent is expropriated by the state and is of great significance to the national economy, public interests or national defense construction, the state may expropriate the invention and give the patentee reasonable compensation. What circumstances are not patent infringement?
? For the purpose of public health, the patent administration department of the State Council may grant compulsory licenses for the manufacture and export of patented drugs to countries or regions that meet the requirements of relevant international treaties to which People's Republic of China (PRC) is a party.
? According to Article 54 of the Patent Law, in case of national emergency or special circumstances, or for the purpose of public interest, the patent administration department of the State Council may grant compulsory license to exploit the invention patent or utility model patent.