Smoke detector and alarm

Details Smoke detector and alarm Smoke detector and alarm

1974-04-29

1976-02-03

Yusko, Donald J.

Communications: electrical

Systems

Call station

250574, 356207, G08B 1710

Patent

active

039368149

ABSTRACT:
A smoke detector and alarm utilizing two photo resistors, one of which is used to detect smoke in an enclosed chamber and the other of which is used to compensate for line voltage variations and the effect of such variations on the smoke detecting photo resistor, and to supervise or monitor the light source so as to detect and signal light source failure in a distinct way.

REFERENCES:
patent: 3504184 (1970-03-01), Eaton et al.
patent: 3723747 (1973-03-01), Steele
patent: 3774186 (1973-11-01), Enemark

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