What are Patents?
What is the difference between a patent and a trademark or copyright? Here is an explanation from the U.S. Patent and Trademark Office.
Chemical Patents
A concise and useful guide, specifically geared to chemical patent searching, was originally created by Gary Wiggins, an expert in chemical information at Indiana University. It is now part of a Wikibooks.
Patent Databases
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SciFinder-n (CAS)Primarily for journal literature searching, it also includes patents and can link directly to the full text of U.S. patents. Use the limit feature and narrow your search to Patents only. One-time registration required.
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U.S. Patent databaseA complete search of United States Patent and Trademark Office patents. Includes images and the full text of patents.
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Esp@cenetEurope's network of patent databases
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PatentScopeThe World Intellectual Property Organization's international patent search.