Ultrasonic vehicle alarm system

Details Ultrasonic vehicle alarm system Ultrasonic vehicle alarm system

1977-01-05

1978-11-14

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340531, 340558, 307 10AT, B60R 2510

Patent

active

041258266

ABSTRACT:
An alarm system utilizing a vehicle transmitter of pulsed ultrasonic energy directed to a stationary receiver outside the vehicle and which renders an alarm if the receiver does not receive ultrasonic energy of a given frequency for a preset time period. The vehicle transmitter is disabled in response to an intruder alarm in the vehicle detecting the presence of an intruder. The receiver alarm thus is activated either by the presence of an intruder or by the vehicle being moved a sufficient distance from the receiver.

REFERENCES:
patent: 3112486 (1963-11-01), Alder
patent: 3157871 (1964-11-01), Umanoff
patent: 3192507 (1965-06-01), Sudges
patent: 3605082 (1971-09-01), Matthews
patent: 3703714 (1972-11-01), Andrews
patent: 3914753 (1975-10-01), Cho
patent: 3988724 (1976-10-01), Anderson

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