Middle Years
The United States Attorney General sued De Forest for fraud (in 1913) on behalf of his shareholders, stating that his claim of regeneration was an "absurd" promise (he was later acquitted). Nearly bankrupt with legal bills, De Forest sold his triode vacuum-tube patent to AT&T and the Bell System in 1913 for the bargain price of $50,000.
De Forest filed another patent in 1916 that became the cause of a contentious lawsuit with the prolific inventor Edwin Howard Armstrong, whose patent for the regenerative circuit had been issued in 1914. The lawsuit lasted twelve years, winding its way through the appeals process and ending up before the Supreme Court in 1926. The Supreme Court ruled in favor of De Forest, although the view of many historians is that the judgment was incorrect.
Read more about this topic: Lee De Forest
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