Bulb outage warning system

Details Bulb outage warning system Bulb outage warning system

1974-04-22

1976-10-19

Caldwell, John W.

Communications: electrical

Systems

Call station

307235R, 340 80, 340248D, 340248E, 340248P, 340253P, 340253Q, 340253S, G08B 2100

Patent

active

039874249

ABSTRACT:
A warning system for detecting a burned out or defective bulb for a motor vehicle is disclosed. A transmitting circuit is connected to detect current flow through the bulb to be monitored. Failure of the bulb to draw current causes the transmitting circuit to produce a series of small voltage pulses on the battery line. These pulses are detected by a receiving circuit which causes an outage indicator light to be illuminated.

REFERENCES:
patent: 3140405 (1964-07-01), Kolling
patent: 3252157 (1966-05-01), Pabst
patent: 3421157 (1969-01-01), Atkins
patent: 3453555 (1969-07-01), Bacon
patent: 3624629 (1971-11-01), Donaldson
patent: 3633196 (1972-01-01), Winkler et al.
patent: 3737845 (1973-06-01), Maroney et al.
patent: 3821645 (1974-06-01), Vinsani

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