Burglar alarm with a multi-phase circuit, fail-safe control circ

Details Burglar alarm with a multi-phase circuit, fail-safe control circ Burglar alarm with a multi-phase circuit, fail-safe control circ

1986-08-25

1987-11-10

Levy, Stewart J.

Communications: electrical

Selective

Having indication or alarm

340541, B60R 2510

Patent

active

047060646

ABSTRACT:
A burglar alarm with a multi-phase circuit, a fail-safe control circuit, an automatic rearm circuit and a two-step disarming circuit which applies a trigger circuit to trigger the alarm by sensors in sequence. The fail-safe control circuit informs the user that the alarm is in operating condition and is normal; the two-step disarming circuit permits temporary disarming and permanent disarming; and the automatic rearm circuit rearms the alarm automatically (if permanent disarming is not completed within a preset time after the temporary disarming) in order to protect a vehicle from external interference.

REFERENCES:
patent: 3891967 (1975-06-01), Betts
patent: 3968474 (1976-07-01), Danahey
patent: 4038635 (1977-07-01), Schotz
patent: 4123745 (1978-10-01), Gurgone
patent: 4174516 (1979-11-01), Cleary
patent: 4539548 (1985-09-01), Crites

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