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US Patents

also known as United States Patent and Trademark Office

Full text US patents and published applications. Patents from 1790 to 1975 are searchable only by Patent Number and Current US Classification. From 1976 they are searchable by all fields. Note: images will be read-only unless your pc has the appropriate TIFF reader. For more information, see http://www.uspto.gov/patft/help/images.htm