Lamarr Patents Frequency Hop: Wi-Fi's Ancestor Born

A Hollywood actress and an avant-garde composer walked into the U.S. Patent Office on August 11, 1942, with an idea that would take half a century to find its true purpose. Hedy Lamarr and George Antheil received Patent No. 2,292,387 for a "Secret Communication System" that used frequency-hopping to prevent the jamming of radio-controlled torpedoes. The Navy shelved it. The technology eventually became foundational to Bluetooth, Wi-Fi, and GPS. Lamarr, born Hedwig Eva Maria Kiesler in Vienna, was far more than the glamorous star MGM marketed to audiences. She had fled a controlling marriage to Austrian arms dealer Fritz Mandl, who had entertained Nazi officials at dinner parties where military technology was openly discussed. Lamarr absorbed those conversations. After escaping to America and establishing herself in Hollywood, she began tinkering with inventions in her spare time, driven by a desire to help the Allied war effort after learning that German U-boats were sinking refugee ships. She met Antheil, known for his experimental compositions involving synchronized player pianos, at a dinner party. Their collaboration was logical: Lamarr conceived the idea of rapidly switching radio frequencies between transmitter and receiver, making signals nearly impossible to intercept. Antheil contributed the synchronization mechanism, drawing on his experience coordinating mechanical instruments. The military deemed the system impractical for wartime use, and the patent expired in 1959 without generating a cent for its inventors. But engineers at Sylvania independently developed similar technology during the Cuban Missile Crisis, and by the 1980s, spread-spectrum techniques became central to secure military communications. The commercial applications followed in the 1990s. Lamarr received belated recognition with the Electronic Frontier Foundation Pioneer Award in 1997, three years before her death.