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De Forest continued to claim that he developed the Audion independently from John Ambrose Fleming's earlier research on the thermionic valve (for which Fleming received Great Britain patent 24850 and the American Fleming valve patent U.S. patent 803,684), and de Forest became embroiled in many radio-related patent disputes. De Forest was famous ...
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.
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.
Government patent use law is a statute codified at 28 USC § 1498(a) [1] that is a "form of government immunity from patent claims." [2] [1] Section 1498 gives the federal government of the United States the "right to use patented inventions without permission, while paying the patent holder 'reasonable and entire compensation' which is usually "set at ten percent of sales or less".
Lee De Forest filed US patent 1170881 in 1914 that became the cause of a contentious lawsuit with Armstrong, whose patent for the regenerative circuit had been issued in 1914. The lawsuit lasted until 1934, winding its way through the appeals process and ending up at the Supreme Court .
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]
In 1913, after vacuum-tube inventor Lee de Forest began to suffer financial difficulties, AT&T bought De Forest's vacuum-tube patents for the bargain price of $50,000 ($1.54 million in 2009 dollars [1]). In particular, AT&T acquired ownership of the ' Audion ', the first triode (three-element) vacuum tube, which greatly amplified telephone ...
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.