Find just what you are looking for by keyword, patent number, class or assignee name, and up to 40 other criteria on this site. In addition, customized patent searches can be set up to automatically execute on a weekly, monthly, or quarterly basis. Derwent holds all U.S. patent information dating back to 1974 and European patents to 1978. Also available on the site is patent news, a patent showcase, patent glossary, and patent point with an index of other patent sites on the web. This site is updated constantly; check it out at www.derwent.com.