The following Web sites are useful sources of current information. A commercial service dedicated to IP information. Derwent Thomson Scientific Provider of patent and scientific information products and services. MicroPatent Searchable directory for patents and trademarks.
Registration is free, however, there is a usage fee.
Japan Patent Information Organization Japio provides detailed information on Japanese patents. The Dialog Corporation A leading provider of technical and business information. Sources of Information on Patents and Intellectual Property American Intellectual Property Law Association National bar association constituted of IP lawyers. Web Site Legal resources for dealing with invalid patents. The site includes a comprehensive directory of related links.