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the military classified Patent 2,292,387 as top secret and, in the 1950s, gave it to a contractor for the construction of a sonobuoy that could detect submarines in the water and then transmit that information to an airplane above using Hedy’s unjammable frequency-hopping idea. Later, the military and other private entities began to make their own inventions using this interpretation of spread-spectrum technology—without any recompense to Hedy, as the patent had expired—and today, aspects of her frequency-hopping idea can be found in the wireless devices we use every day. Hedy’s role in these advancements was unknown until the 1990s, when she received a few awards for her invention, recognition she considered more important than the success of her movies.
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