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Google Patent Search
Searches the United States Patent and Trademark Office and the European Patent Office; however, it does not necessarily find all the patents in the these databases.
Full text patent databases of the US Patent and Trademark Office (USPTO).
European Patent Office
Search for patents from many countries and regions.
Derwent Innovations Index
Contains abstracts of patents with possible links to cited and citing patents, and cited articles. Sections include Chemical, Electrical and Electronic, and Engineering. This database is part of Web of Knowledge.
Foreign Patent Sites
For almost all foreign patent searches Espacenet opens new window will work better than country specific patent sites.
Japan's Industrial Property Digital Library
A tricky search interface, but sometimes the only way to get Japanese patents. This is a direct link to the Patent & Utility Model Gazette Database.
Japanese Patent FAQs
How to get Japanese full-text or English machine translations. Very helpful guide to Japanese patents from Espacenet.