Keywords: US Patent X1 - Randolph Signature.png United States Patent X1 png US patent X1 awarded to Samuel Hopkins http //patimg1 uspto gov/ piw Docid X0000001 idkey NONE US Patent n° X1 1790-07-31 US Government PD-US-patent-no notice Image Hopkins patent 1 gif PD-USGov United States Patent X1 |