|The History of Fluorescent Lights|
|Inventors: Peter Cooper Hewitt, Edmund Germer, George Inman and Richard Thayer|
|Peter Cooper Hewitt - U.S. patent 889,692|
When most people think of lighting and lamps, they think of the incandescent light bulb developed by Thomas Edison and other inventors. Incandescent light bulbs work by using electricity and a filament. Heated by electricity, the filament inside the light bulb exhibits resistance that results in high temperatures that causes the filament to glow and emit light. Arc or vapor lamps work in a different way (fluorescents fall under this category), the light is not created from heat, the light is created from the chemical reactions that occur when electricity is applied to different gases enclosed in a glass vacuum chamber.
In 1857, the French physicist Alexandre E. Becquerel who had investigated the phenomena of fluorescence and phosphorescence, theorized about the building of fluorescent tubes similar to those made today. Alexandre Becquerel experimented with coating electric discharge tubes with luminescent materials, a process that was further developed in later fluorescent lamps.
American, Peter Cooper Hewitt (1861-1921) patented (U.S. patent 889,692) the first mercury vapor lamp in 1901. The low pressure mercury arc lamp of Peter Cooper Hewitt is the very first prototype of today's modern fluorescent lights. A fluorescent light is a type of electric lamp that excites mercury vapor to create luminescence.
Marty Goodman in his History of Electric Lighting states, "In 1901, a now-forgotten inventor named Peter Cooper Hewitt invented an arc lamp that used mercury vapor. The vapor was enclosed in a glass bulb. This was the first enclosed arc-type lamp using metal vapor. In 1934, a high pressure variant of this was developed [by Edmund Germer], which could handle a lot more power in a smaller space...
...The low pressure mercury arc lamp of Peter Cooper Hewitt is the very direct parent of today's modern fluorescent lights. It was found that these low pressure [mercury] arc lamps would put out large amounts of ultra-violet light. Folks then figured that if they coated the inside of the light bulb with a fluorescent chemical (one that absorbed UV light and re-radiated that energy as visible light) they could make an efficient light source."
Edmund Germer (1901 - 1987) invented a high pressure vapor lamp, his development of the improved fluorescent lamp and the high-pressure mercury-vapor lamp allowed for more economical lighting with less heat. Edmund Germer was born in Berlin, Germany, and educated at the University of Berlin, earning a doctorate in lighting technology. Together with Friedrich Meyer and Hans Spanner, Edmund Germer patented an experimental fluorescent lamp in 1927.
Edmund Germer is credited by some historians as being the inventor of the first true fluorescent lamp. However, it can be argued that fluorescent lamps have a long history of development prior to Germer.
George Inman and Richard Thayer - The First Commercial Fluorescent Lamp
George Inman lead a group of General Electric scientists researching an improved and practical fluorescent lamp. Under pressure from many competing companies the team designed the first practical and viable fluorescent lamp (U.S. Patent No. 2,259,040) that was first sold in 1938. It should be noted that General Electric bought the patent rights to Edmund Germer's earlier patent.
According to The GE Fluorescent Lamp Pioneers, "On Oct 14, 1941 U.S. Patent No. 2,259,040 was issued to George E. Inman; the filing date was Apr 22, 1936. It has generally been regarded as the foundation patent. However, some companies were working on the lamp at the same time as GE and some individuals had already filed for patents. GE strengthened its position when it purchased a German patent that preceded Inman's. GE paid $180,000 for U.S. Patent No 2,182,732 that had been issued to Friedrich Meyer, Hans J. Spanner and Edmund Germer. While one might argue the real inventor of the fluorescent lamp, it is clear that GE was the first to introduce it."
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