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SciFinder-n (CAS) This link opens in a new window
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.
U.S. Patent database
A complete search of United States Patent and Trademark Office patents. Includes images and the full text of patents.
Europe's network of patent databases
The World Intellectual Property Organization's international patent search.