Vehicle alarm apparatus

Details Vehicle alarm apparatus Vehicle alarm apparatus

1982-07-19

1985-09-03

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

307 10AT, B60R 2510

Patent

active

045395489

ABSTRACT:
A vehicle alarm system sensing unauthorized use of the vehicle and providing a warning signal for a predetermined warning time interval which may be extended as desired. A latching circuit includes a bistable flip-flop with a capacitor discharging through a voltage divider circuit to define an extended warning time interval. Logic gates are switched to change the voltage divider circuit voltage reference levels to charge the capacitor during a predetermined exit time interval to inhibit warning signal actuation when exiting the vehicle. A re-entry timer is included to inhibit warning signal actuation when re-entering the vehicle.

REFERENCES:
patent: 3930226 (1976-12-01), Plumberg

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