Ad
related to: de forest diode patent definition
Search results
Results From The WOW.Com Content Network
De Forest was granted a patent for his early two-electrode diode version of the Audion on November 13, 1906 (U.S. patent 841,386), and the "triode" (three-electrode) version was patented in 1908 (U.S. patent 879,532).
The first Audions had only two electrodes, and on October 25, 1906, [22] de Forest filed a patent for the diode vacuum tube detector, that was granted U.S. patent number 841387 on January 15, 1907. Subsequently, a third "control" electrode was added, originally as a surrounding metal cylinder or a wire coiled around the outside of the glass tube.
The name "triode" appeared later, when it became necessary to distinguish it from other kinds of vacuum tubes with more or fewer elements (diodes, tetrodes, pentodes, etc.). There were lengthy lawsuits between De Forest and von Lieben, and De Forest and the Marconi Company, who represented John Ambrose Fleming, the inventor of the diode. [22]
John Ambrose Fleming developed a vacuum tube diode. Lee de Forest placed a screen, added a "grid" electrode, creating the triode. [55] Early radios ran the entire power of the transmitter through a carbon microphone. In the 1920s, the Westinghouse company bought Lee de Forest's and Edwin Armstrong's patent.
English engineer John Ambrose Fleming invented the diode. 1906: American inventor Lee de Forest invented the triode. 1908: Scottish engineer Alan Archibald Campbell-Swinton, laid out the principles of television. 1909: Mica capacitor was invented by William Dubilier. 1911: Dutch physicist Heike Kamerlingh Onnes discovered Superconductivity. 1912
The use of magnetic fields as a means to control the flow of an electric current was spurred by the invention of the Audion by Lee de Forest in 1906. Albert Hull of General Electric Research Laboratory, USA, began development of magnetrons to avoid de Forest's patents, [1] but these were never completely successful. Other experimenters picked ...
Lee De Forest [168] [169] [170] had an interest in wireless telegraphy, and he invented the Audion, initially a diode tube, in 1906, and subsequently a triode version in 1908. He was president and secretary of the De Forest Radio Telephone and Telegraph Company (1913).
Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s.. In 1919 and 1920, de Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines.