Vehicle alarm

Details Vehicle alarm Vehicle alarm

1978-08-22

1980-11-04

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340 65, 340568, 340652, 307 10AT, B60R 2510

Patent

active

042322880

ABSTRACT:
Method and apparatus for detecting theft or tampering with a vehicle. The method includes monitoring the impedance of individual circuit elements within the electrical system and triggering an alarm whenever the impedance of a circuit element exceeds or falls below predetermined threshold levels. The apparatus includes a transistor switching circuit coupled through diode bridges to individual circuit elements of the vehicle's electrical system.

REFERENCES:
patent: 3614734 (1971-10-01), Davis
patent: 3671934 (1972-06-01), Teich
patent: 4037194 (1977-07-01), Boyden et al.

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