2. Compulsory license in case of national emergency.
3. Compulsory licensing of patent dependence.
Legal basis: Article 51 of the Patent Law of People's Republic of China (PRC). Compared with the previous patented invention or utility model, a patent for invention or utility model is a major technological progress with great economic significance, and its implementation depends on the implementation of the previous invention or utility model. The patent administration department in the State Council may grant a compulsory license to exploit the previous invention or utility model upon the application of the latter patentee.
Where a compulsory license is granted in accordance with the provisions of the preceding paragraph, the administrative department for patent in the State Council may also grant a compulsory license to exploit the latter invention or utility model upon the application of the former patentee.