Inventions By virginia grace Period: Jan 1, 1840 to Jan 1, 2015 Inventions Period: Jan 1, 1853 to Jan 1, 1962 Inventions Mar 21, 1882 Lewis Latiner, Invented Carbon Filament Light Bulb Oct 27, 1891 Paul Downing, Invented Mail Box Oct 13, 1914 Garrett Morgan, Invented Gas Mask Nov 20, 1923 Garrett Morgan, Invented Traffic Signal Jul 6, 1971 Henry Sampson, Invented Cellular Phone