Patents
- (Britain) Patents Status Enquiry - search the British Patent Office's patent register for patent application numbers or published patent numbers (British, or a granted EP designating GB)
- Chemical Patents Plus - full text of all chemical patents issued by the U.S. Patent and Trademark Office from 1971, plus images from 1 Jan 1994
- Delphion - searchable US patent material. The main feature allows known patent numbers from numerous patent authorities to be searched. This provides bibliographic details and often an image of the front page
- Esp@cenet- search all patents published in the past two years by any national office in the European Patent Organisation
- MicroPatents's PatentWEB
- Patent Information at the British Library - large number of links to detailed information, databases, designs, Patent Offices and Internet sites
- UK Patent Office
- US Patents and Trademark Office - searchable file, updated weekly,containing over 2 million U.S. Patent Grants (full-text since 1976, full-page images since 1790) and Patent Applications (since 15 March 2001)
Local suggestions for sites to be included welcomed, contact jmy.