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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.
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).
In 1906, Lee De Forest of the US added a control "grid" to the valve to create an amplifying vacuum tube RF detector called the Audion, leading Fleming to accuse him of infringing his patents. De Forest's tube developed into the triode the first electronic amplifier. The triode was vital in the creation of long-distance telephone and radio ...
The first prototype Fleming valves, built October 1904. Early commercial Fleming valves used in radio receivers, 1919 Fleming valve schematic from US Patent 803,684.. The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers used in electromagnetic ...
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
[11] [12] [13] [8] Starting in October 1906 [9] De Forest patented a number of three-element tube designs by adding an electrode to the diode, which he called Audions, intended to be used as radio detectors. [14] [7] The one which became the design of the triode, in which the grid was located between the filament and plate, was patented January ...