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Patent Search Engines
Google Patents - Advanced Patent Search
All U.S. patents, issued and pending, with diagrams. Search by keyword, number, inventor, title, classification or date.
Free Patents Online
One of the most powerful, fastest and easiest patent search engines on the web. Our search allows advanced search techniques such as word stemming, proximity searching, relevancy ranking and search term weighting to help you find exactly what you are looking for.
U.S. Patent & Trademark Office
The USPTO houses full text for patents issued from 1976 to the present and TIFF images for all patents from 1790 to the present. Includes copyrights, trademarks and IP law and policy.
International Patent Search
PatentScope enables you to do searches in 1,864,332 published international patent applications (PCT) and in 7,747,749 when including patent documents from Regional and National collections.