Knowledgeable advice on all aspects of patents. The sections on searching and classification schemes are essential reading if you are considering doing your own searches. They also have a fee paying service to conduct a search on your behalf.
Contains data from 70 patent offices around the world (Most of the information has a subscription charge).
Free searchable databases of UK, European and World patents.
Search the full text of US patents using Google.
Contains the first page data (bibliographic data, abstract and drawing) of published PCT (i.e. world) applications. The database currently contains data relating to applications published since 1 January 1997.
Government-backed site providing information on copyright, trade marks, designs and patents.
Includes the full text of all US patents since 1976 and full-page images of each page of every US patent issued since 1790. Images are published in TIFF format only. Updated weekly. Full-text and images of all US patent applications published since 15 March 2001. Free to search.