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Patent Searching: Websites
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Patents: A How-To-Find Guide
Guide from Iowa State university Library.
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WIPO statistics on patents
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Espacenet (European Patent Office) is the place to start you patent search.
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Index to the United States Patent Classification (USPC) System
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World Intellectual Property Organization (WIPO) home
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Just for fun
Crazy Patents - from Free Patents Online
Includes the Beerbrella and Tricycle Lawnmower
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