British Library - list of (mostly) free Internet-accessible patent databases.
Community of Science--Search U.S. patents.
esp@cenet-Europe's network of patent databases. This is the European Patent Office's (EPO) search site for patents and applications from the EPO and the World Intellectual Property Organization (PCT). View and copy complete documents.
European
Patent Office (EPO)--The European Patent Office (EPO) has an
impressive list of links of patent related web-sites.
Patent Information Users Group
Patent Searching on the Web -- A list of free patent search engines. Viewing and downloading of patent abstracts and claims available. However, there are costs associated with some services (e.g., obtaining full patent documents by mail). If you choose to use these services the costs will be your responsibility.
Rolf Claessen's Chemistry Index--Use this tool to search American Patents chronologically or by relevance.
Last updated: 16-Jan-2008