Who discovered Diodes & in which year
Thermionic diode principles were rediscovered by Thomas Edison on February 13, 1880 and he was awarded a patent in 1883 (U.S. Patent 307,031 ), but developed the idea no further. Braun patented the crystal rectifier in 1899 . Brauns discovery was further developed by Sir Jagdish Bose into a useful device for radio detection.
The first radio receiver using a crystal diode was built around 1900 by Greenleaf Whittier Pickard. The first thermionic diode was patented in Britain by John Ambrose Fleming (scientific adviser to the Marconi Company and former Edison employee) on November 16, 1904 (U.S. Patent 803,684 in November 1905). Pickard re ...more