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This was the first light bulb that used a filament made from tungsten instead of carbon. The inscription reads: wire lamp with a drawn wire – indestructible. US575002A patent on 01.Dec.1897 to Alexander Lodyguine (Lodygin, Russia) describes filament made of rare metals, amongst them was tungsten.
A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen, such as iodine or bromine.
To produce enough light, these lamps required the use of extremely long filaments, which remained so until the development of more efficiently wound tungsten filaments. In the 1960s, US inventor Robert (Bob) Kyp patented a similar in appearance but flickering "electric flame" light bulb under the name Balafire [6] as well as radiometers.
In 1905, Just and Hanaman patented a process for producing tungsten filaments by plating carbon filaments with tungsten, then removing the carbon by heating. [4] These early tungsten lamps were more efficient than a carbon filament lamp, because they could operate at a high temperature, due to the high melting point of tungsten.
In its modern form, the incandescent light bulb consists of a coiled filament of tungsten sealed in a globular glass chamber, either a vacuum or full of an inert gas such as argon. When an electric current is connected, the tungsten is heated to 2,000 to 3,300 K (1,730 to 3,030 °C; 3,140 to 5,480 °F) and glows, emitting light that ...
Tung-Sol Lamp Works was licensed to produce lamps in tungsten-filament from General Electric through royalty-free rights for their patent. Tung-Sols' license was a B license allowing only paying a quota and percentage of production for large or small bulb manufacturing to General Electric without exports of goods.
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