English electrical engineer and physicist who invented the thermionic valve, the diode later known as the Fleming valve, in 1904. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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Invented the thermionic valve, the first vacuum tube.
Invented
Source Vacuum Tube (Wikipedia)
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1. John Ambrose Fleming (Wikipedia)
Wikimedia FoundationLead sectionQuote, Lead section
Sir John Ambrose Fleming (29 November 1849 - 18 April 1945) was an English electrical engineer and physicist.
Vacuum Tube (Wikipedia)
WikipediaInvented: Vacuum Tube, History section (inventor attribution)Quote, Invented: Vacuum Tube, History section (inventor attribution)
The first, and simplest, vacuum tube, the diode or Fleming valve, was invented in 1904 by John Ambrose Fleming.
Frequently Asked Questions
Why was John Ambrose Fleming's patent for the Fleming valve later invalidated?
The Supreme Court of the United States invalidated Fleming's Fleming valve patent over an improper disclaimer and because the technology was already known art when he filed it.
Fleming patented his two electrode vacuum tube, the oscillation valve known as the Fleming valve, in 1904 while working to improve transatlantic radio reception for the Marconi Company. The Supreme Court of the United States later invalidated the patent because of an improper disclaimer, and it also held that the technology described in the patent was already known art at the time Fleming filed it.
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