Patents
| Delphion Intellectual Property Network | Databases of patents from the U.S.A., Europe, Japan and PCT patents application data from World Intellectual Property Organization (WIPO). Descriptions and images of most patents are available free of charge, the full text can be downloaded for a fee |
| European Patent Office | Uses Esp@cenet - an index to European, worldwide and national patents |
| FreePatentsOnline.com | Patent searching database |
| Intellectual Property | Government backed web site provding information about U.K. intellectual property including patents |
| Patent and other intellectual property offices worldwide | From the British Library |
| Patents Information Service | From the British Library Science Technology Business has links to patent and other intellectual property information resources |
| U.S. Patent and Trademark Office | Includes the U.S. full text database of patents since 1976 |
| World International Property Organization | Includes texts of Treatries on Intellectual Property adminstered by WIPO |
| Yahoo: patent information | Includes links to national services |