Popular websites for downloading patents

1. Patent search and query system of State Intellectual Property Office of P.R.C
http://www.pss-system.gov.cn/sipopublicsearch/portal/uiIndex.shtml
Includes all patents at home and abroad since 1985. Registration needed for certain functions.

2. CPRS China Patent Information Center Star
http://search.patentstar.cn/frmLogin.aspx
Registration needed.

3. Patent Information Service Platform for National Leading Enterprises
http://www.chinaip.com.cn/

4. Patent Cloud database
https://www.patentcloud.com/
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
http://www.soopat.com/
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
https://worldwide.espacenet.com/
Free resource.

7. The United States Patent and Trademark Office (USPTO)
https://www.uspto.gov/
http://www.drugfuture.com/uspat/us_patent.asp
Free resource.