Philadelphia, PA, United States
Samuel Hopkins (1743-1818). The holder of the first U.S. patent, signed by George Washington, lived here. On July 31, 1790, Hopkins received a patent for an improvement in making potash, a major industrial chemical. In succeeding centuries, the U.S. Government issued millions of patents.
Listen to the audio guide for Samuel Hopkins blue plaque Free on WIP — starts by itself when you arrive, even with the screen off