when did thomas edison patent the light bulb invented
Continuing to improve his design, by November 1879, he filed for a U.S. patent for an electric lamp using âa carbon filament or strip coiled and connected â¦ to platina contact wiresâ. The filament was made from a piece of carbonized thread. From coneption to invention, this is one of Thomas Edison's early light bulbs. By New Yearâs he was demonstrating lamps using carbonized cardboard filaments to large crowds at the Menlo Park laboratory.