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Google patent search

Searches the full text of the U.S. Patent and Trademark Office dating as far back as 1790. Each patent search includes the patent summary, claims, drawings, citations, and referenced by notes. Applications, international patents, and those approved in the past few months are not included. Advance search by patent number, title, inventor, assignee, US Classification, International Classification, Patent type/status, date. Limitable by date, filing status, patent type

Date Coverage: 
1790 to present
Content Availability: 
Full Text