Google Patents
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Google PatentsSearch for granted patents and applications from USPTO and translated patents from multiple international bodies. See About link for an updated list of countries. Also related non-patent literature. Filters are applied post-search.
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About Google PatentsTips on searching Google patents, including operators.
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Cooperative Patent ClassificationHarmonized system used by USPTO and EPO for classifying patents.
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Advanced Google Patents (new)Select criteria before searching for better results.
Searching Google Patents
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Google PatentsStart with a keyword search, and then filter your results.
The new Google Patents search tool (released in 2015) groups the results based on Cooperative Patent Classification (CPC) when possible. Click on ? to view other patents in this class.
You can add synonyms and search terms and also filter by date, assignee, inventor, patent office, language, filing status, citing patent and CPC class.
