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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 3987422 | System for detecting signal quality of a phase-modulated wave A system for detecting the signal quality of a phase-modulated wave, in which the phase positions of the signal elements of the digital phase-modulated wave are each detected with respect to a reference phase carrier by a phase detector for developing dig... | 10/19/1976 |
| 3953848 | Electrocardiograph telemetry system including method and means for indicating inoperative conditions Special circuitry in the transmitter of an electrocardiograph (ECG) telemetry system detects various malfunctions of the system and changes the transmitted signal to indicate their presence to the system receiver. When the transmitter detects that an inpu... | 04/27/1976 |
