Research by Subject: Electrical and Computer Engineering: Find Patents & Trademarks

Patents & Trademarks

Google Patents
Patents and patent applications from the United States Patent and Trademark Office (USPTO). Has a thumbnail viewer for drawings.
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Sporadically updated. More about Google Patent Search .
USPTO Patent Database
Full text and images of U.S. patents.
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To view the full text patents, a plug-in is required. Go to the USPTO help page for more information. Full text for patents from 1976 - current. Pre-1976 patents are searchable only by patent number and current classification code.
Espacenet
Identifies patents from many countries, some with page images.
FreePatentsOnline
Full text and images of U.S. patents from 1974+, U.S. patent applications from 2001+, and European patents 2000+.
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View patent images as pdf or other formats.
Chinese Patent Search
WIPO: World Intellectual Property Organization Patent Search
Search international patent applications