## The Legacy Question
Every account of Hedy Lamarr’s invention eventually arrives at the legacy question: what did it actually lead to? The range of answers in popular journalism spans from “nothing” — the patent was never used — to “everything” — she invented modern wireless communication. Neither is right.
The documented links are as follows. The United States military adopted frequency-hopping systems for anti-submarine sonobuoys in the 1950s. Those systems derived from the same concept as the Lamarr-Antheil patent, but through independent engineering development, not through the patent itself. By 1962, frequency-hopping torpedoes were operational. This represents the clearest functional connection between the patent’s concept and a deployed military system.
Commercial spread-spectrum development accelerated in the 1980s when the FCC opened the Industrial, Scientific, and Medical (ISM) radio bands for unlicensed use and specifically permitted spread-spectrum transmission in those bands. This regulatory change allowed commercial development of frequency-hopping and direct-sequence spread-spectrum systems that had previously been confined to classified military applications. The result was an explosion of commercial wireless technology.
Bluetooth, the short-range wireless standard developed by Ericsson and later formalized by the Bluetooth Special Interest Group, uses adaptive frequency hopping in the 2.4 GHz ISM band — hopping between seventy-nine channels in a pseudorandom sequence to avoid interference. This is the technology most directly comparable to what the Lamarr-Antheil patent described.
Wi-Fi, as currently deployed, does not use frequency hopping. It uses OFDM — Orthogonal Frequency Division Multiplexing — which distributes signal across multiple subcarriers simultaneously rather than hopping between them in time. The conceptual relationship to spread-spectrum is real but indirect.