On December 26, 1933, Edwin Armstrong was granted a patent for a two-path FM radio.
He has been called “the most prolific and influential inventor in radio history”.
Publication number: US1941068 A
Patent Title: Radiosignaling
Publication type: Grant
Publication date: Dec 26, 1933
Filing date: Jan 24, 1933
Priority date: Jan 24, 1933
Also published as: DE621204C
Publication number: US 1941068 A, US 1941068A, US-A-1941068, US1941068 A, US1941068A
Inventors: Edwin H Armstrong
Original Assignee: Edwin H Armstrong