Henry Woodward (inventor)
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Canadian Patent application
Henry Woodward was an early pioneer in the development of the incandescent lamp. On July 24, 1874, he and his partner, Mathew Evans, a hotelkeeper, patented an improved electric light bulb [1] [2]. Woodward was a medical student at the time. Their light bulb comprised a glass tube with a carbon filament. They purged the tube with inert nitrogen to get a longer operating life of the bulb. Their light bulb was sufficiently promising that they were able to sell their U.S. Patent 181,613 to Thomas Edison. Thomas Edison also obtained an exclusive license to the Canadian patent. Thomas Edison raised investment capital to continue improvements in the bulb until he had a light bulb with long enough life to be commercially successful.
[edit] References
- ^ Nigel Bunce and Jim Hunt (March 15, 1984). "The Canadian Electric Light".
- ^ Electrical World and Engineer, vol 35, No 15 (April 14, 1900). "Invention of the Incandescent Lamp",.
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