It is generally believed that the light bulb was invented by Thomas Edison in the United States. However, if this is a severe test, another American, Heinrich G. Bell, invented the same principle and material and the reliability of the light bulb in earlier decades, and many other Edison before him also made great contributions to the invention of the light bulb.
180 1 year, British chemist David platinum wire was electrified to glow. 18 10, he also invented the electric candle to light the arc between two carbon rods.
1854, Henry Goebbels used carbonized bamboo and glass bottles to glow in vacuum. His invention seems to be the first practical incandescent lamp. He was able to test the light bulb for 400 hours, but he didn't apply for a design patent immediately.
1850, Joseph Wilson Swan, an Englishman, began to study electric lights.
1878, he was a British patented power vacuum carbon filament bulb, and started to set up a company in Britain to install electric lights for all families.
1874 applied for two patents for electric lamps in Canada. A glass bulb filled with nitrogen and electrified emits carbon rods. But they don't have enough money to continue to develop this invention. 1875, Thomas Edison's patent was sold.
Edison got a patent and tried to make better use of filament.
1879, he replaced the carbon filament bulb and successfully kept it for 13 hours.
1880, he successfully saved the carbonized bamboo light bulb laboratory 1200 hours. However, in Britain, Swan sued Edison for patent infringement and won. Edison electric power company was forced to join Swann and become a partner of Britain. But later Swan sold his interests and patents to Edison. Edison's patent also brought challenges in the United States. The United States Patent Office ruled that his invention had a criminal record and was invalid. Finally, after years of litigation, Edison granted the carbon filament incandescent lamp a patent. about
Edison found that tungsten wire was used instead of carbon wire.
Then in 1906, Ge invented a tungsten wire for making light bulbs. Finally, the cheap manufactured tungsten light bulb is still in use.