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When the U.S. military finally deployed frequency-hopping spread spectrum on Navy ships during the 1962 Cuban Missile Crisis blockade, the patent that described the technique had expired three years earlier, and its inventor was watching the news in a Los Angeles bungalow without any idea her idea was at sea.

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On August 11, 1942, the U.S. Patent Office granted Patent No. 2,292,387 for a “Secret Communication System” to two inventors…