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• Delphion Research Intellectual Property Network
  Search and view patent documents from the United States. Before searching, you must complete the free basic search registration.
  URL: http://www.delphion.com/research/  Added: October 9, 2007

• U.S. Patent Office Database
  Search this database for issued patents and published patent applications.
  URL: http://www.uspto.gov/patft/  Added: October 9, 2007

• Intellectual Property Digital Library
  Use this site to search European patents, trademarks, and industrial designs.
  URL: http://www.wipo.int/ipdl/en/  Added: October 9, 2007

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