In 1889, black American inventor W.H. Richardson was issued two patents for a "Child's Carriage" (U.S. Nos. 405,599 - 600) In 1886, he had already also patented a "Cotton Chopper".
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In 1895, Thomas L. Willson received a U.S. patent on the “Calcium-Carbide Process” (No. 541,137) that he had accidentally discovered on 2 May 1892.
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In 1912, a patent was issued for a mercury vapor lamp to Peter Hewitt (U.S. No. 1,030178).
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