<P> After many experiments , first with carbon filaments and then with platinum and other metals , Edison returned to a carbon filament . The first successful test was on October 22 , 1879 ; it lasted 13.5 hours . Edison continued to improve this design and on November 4 , 1879 , filed for U.S. patent 223,898 ( granted on January 27 , 1880 ) for an electric lamp using `` a carbon filament or strip coiled and connected to platina contact wires '' . This was the first commercially practical incandescent light . </P>
<P> After many experiments , first with carbon filaments and then with platinum and other metals , Edison returned to a carbon filament . The first successful test was on October 22 , 1879 ; it lasted 13.5 hours . Edison continued to improve this design and on November 4 , 1879 , filed for U.S. patent 223,898 ( granted on January 27 , 1880 ) for an electric lamp using `` a carbon filament or strip coiled and connected to platina contact wires '' . This was the first commercially practical incandescent light . </P>
when did the first light bulb get invented
when did the first light bulb get invented
November 4 , 1879
November 4 , 1879