One of the world's most comprehensive databases of patents information. Over 11 million basic inventions and 20 million patents are covered from over 40 patent-issuing authorities dating back to 1963. Derwent provides access to the fulltext of most patents.
Espacenet is Europe's network of patent databases. It provides access to the fulltext of patents dating back to 1836. Using Espacenet it is possible to search a worldwide database of published patents from over 80 countries and regions.
World's largest collection of chemistry and related science information. Search for substances, reactions, and patent and journal references.
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Provides access to US patents from the United States Patent and Trademark Office back to 1790. Full text searching is available for US patents after 1975 and for earlier patents – patent number and classification searching is available.