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Hedy Lamarr: A Real Patent and an Overstated Legacy

By Infinite Creation · Profile

At a Glance

Hedy Lamarr (1914-2000), the film actor, and the composer George Antheil patented a "Secret Communication System" in 1942: a frequency-hopping scheme intended to make radio-guided torpedoes resistant to jamming, with transmitter and receiver stepping through frequencies in a synchronised pattern. The patent is real and the invention was genuinely theirs. Its influence on modern wireless is routinely overstated.

Lived: 1914-2000, Austria, later the United States
Anchor year: 1942, the frequency-hopping patent
Strand: overlooked, then over-corrected

Career

The problem as it stood

A radio-guided torpedo is only as reliable as its control link, and a control link on a fixed frequency can be jammed by transmitting noise on that frequency. Staying on one channel is the vulnerability.

What she actually did

Lamarr, who had absorbed a good deal about munitions during her first marriage to an Austrian arms manufacturer, proposed hopping the control signal between frequencies so no single jammer could follow it. Antheil contributed the synchronisation mechanism, using perforated paper rolls of the kind used in player pianos to keep both ends stepping in step.

How it worked

Transmitter and receiver hop through a known pseudo-random sequence of frequencies. A jammer that does not know the sequence can block only whichever frequency it happens to be on, so most of the message survives. The principle is sound and is a genuine ancestor of spread-spectrum technique.

What it made possible

Not much, directly. The US Navy did not adopt it during the war. The mechanical synchronisation was impractical for the application. Frequency hopping and spread spectrum were developed substantially independently in later decades, drawing on a wider body of work.

What happened to her

The patent expired unexploited. Her contribution went unrecognised for decades and she received no money for it. Recognition arrived late in her life, and she and Antheil were inducted into the National Inventors Hall of Fame in 2014, after her death.

Where the credit landed

Lamarr and Antheil patented a frequency-hopping system in 1942. It was not adopted during the war and the direct line often drawn from it to Wi-Fi, Bluetooth and CDMA is not supported: those descend from a broader body of spread-spectrum work developed largely independently. Her case is doubly instructive: first she was ignored because she was a film actor and a woman, then over-claimed in the correction. The patent stands on its own without inflation.

Known For

The patent is genuine. The direct line to Wi-Fi and Bluetooth is not.
Antheil's player-piano synchronisation is why it was impractical in 1942.
This is a case of erasure followed by over-correction, both distort.

Knowledge Base

What You'll Learn

Correcting an omission by overstating the claim creates a new problem.

What frequency hopping actually became

Spread-spectrum techniques matured through military research across the 1950s and 60s and reached civilian use in the 1980s and 90s. Lamarr and Antheil's patent is a legitimate early instance of the idea and is cited as such. It is not the origin of Bluetooth or Wi-Fi, and claiming so invites a rebuttal that then discredits the genuine achievement, which is the practical reason to state it accurately.

Where This Fits

Lamarr's patent is a transmission idea with an inflated legacy, the kind of credit question covered in A History of Broadcast Technology.

FAQ

Q: Did Hedy Lamarr invent Wi-Fi?
A: No. She and George Antheil patented a frequency-hopping system in 1942 for jam-resistant torpedo guidance. It was not adopted at the time, and modern spread-spectrum wireless developed largely independently from a broader body of work.

Q: Was the invention really hers?
A: Yes. The concept of hopping frequencies to defeat jamming was hers, informed by exposure to munitions work. Antheil contributed the synchronisation mechanism. The patent is genuine and was granted in 1942.

Sources

The patent was checked against the record, including the name it was filed under. Checked 20 August 2026.

US Patent 2,292,387, Secret Communication System. Filed 10 June 1941 and granted 11 August 1942. The record names two inventors, Hedy Kiesler Markey and George Antheil. Markey was Lamarr's married name at the time, which is why the patent index does not show the name she is known by.