Inspired by her knowledge of military technology gained during her marriage to Fritz Mandl, Hedy begins to explore ideas for improving radio communications. She specifically seeks a solution to jamming radio-controlled torpedoes.

Hedy partners with composer George Antheil, who is known for his avant-garde and mechanical compositions, to develop her idea further. Antheil's experience with synchronized player pianos proves valuable in conceiving the system.

Lamarr and Antheil jointly file a patent application for their 'Secret Communication System'. The application details a frequency-hopping spread spectrum technique using punched paper rolls to synchronize frequency changes between transmitter and receiver.

The U.S. Patent Office grants Lamarr and Antheil U.S. Patent 2,292,387 for their frequency-hopping spread spectrum invention.