1. Patent search and query system of State Intellectual Property Office of P.R.C
Includes all patents at home and abroad since 1985. Registration needed for certain functions.
2. CPRS China Patent Information Center Star
3. Patent Information Service Platform for National Leading Enterprises
4. Patent Cloud database
Provide patent information of Mainland China, Taiwan, U.S.A., Korea, Japan, WO and Europe. Full-text of patents can be downloaded.
5. Soopat patent search engine
Search patents in China as well as in other countries, some patents are for free download.
6. Website for downloading European Patent Register and national registers