United States patent certificate [manuscript]
Chicago Historical Society
Clark St. at North Ave.
Chicago, IL 60614-6071
Handwritten patent certificate (letters patent), signed by George Washington, President, U.S., at the City of New York. Granted to Samuel Hopkins of Philadelphia (Pa.), for an apparatus and process for leaching wood ashes to make potash and pearl ash [potassium carbonate]. Signed also by Edmund Randolph, attorney general. Seal is attached. Endorsed on verso by Thomas Jefferson, as delivered Aug. 4, 1790. This is believed to be the first patent granted by the United States Government.