On this day in 1790, the first U.S. patent was issued to Samuel Hopkins
On this day in 1790, the first U.S. patent was issued to Samuel Hopkins for an apparatus used to make pearlash and potash (types of ash used for soap, leavening, […]
On this day in 1790, the first U.S. patent was issued to Samuel Hopkins for an apparatus used to make pearlash and potash (types of ash used for soap, leavening, […]