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has patents from 1790-present. For 1790-1975, you need the patent number to retrieve full images (no keyword searching). For 1976-present, keyword-search the full text. also searches patent applications. Images require special TIFF viewer.
Google Patents includes over 87 million patent publications from 17 patent offices around the world. Use this Advanced Patent Search page to search by patent number, assignee, inventor, and filing date.