Signaling device for preventing automobile theft

Details Signaling device for preventing automobile theft Signaling device for preventing automobile theft

1984-10-05

1986-04-01

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

340 63, 340 65, 340541, 340539, 340522, 307 10AT, 180173, 180287, B60R 2504

Patent

active

045801258

ABSTRACT:
A protective signaling device for the prevention of theft of an automobile, which is arranged to generate an alarm only when the engine of the automobile is started without the use of its ignition key, i.e. without switching an ignition switch of the automobile on. The device includes a pickup capable of detecting a radio wave generated as an electrical noise when the engine is started and of generating a first detection signal upon detection of the radio wave, and a detector adapted for generating a second detection signal when the ignition switch is in the off position. Means is provided for allowing the actuation of an alarm only upon receipt of both of the first and second detection signals at the same time.

REFERENCES:
patent: 4071007 (1978-01-01), Arix
patent: 4110734 (1978-08-01), Lepore et al.
patent: 4186710 (1980-02-01), Kilgore
patent: 4192400 (1980-03-01), McEwan
patent: 4320382 (1982-03-01), Roucek
patent: 4435649 (1984-03-01), Vandigriff
patent: 4538136 (1985-08-01), Turner

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