Smoke detecting device

Details Smoke detecting device Smoke detecting device

1975-05-19

1977-01-04

Caldwell, John W.

Communications: electrical

Systems

Call station

250552, 250574, G08B 1710

Patent

active

040018008

ABSTRACT:
A smoke detector and alarm system incorporating means for detecting airborne particles of smoke and activating an alarm for fire warning purposes, the system including an illuminating circuit having a light emitting diode therein, a smoke sensing and compensation circuit having a pair of photo-electric cells incorporated therein, a comparator and a trigger circuit, and an alarm circuit.

REFERENCES:
patent: 2832946 (1958-04-01), Beck
patent: 3297913 (1967-01-01), Schweitzer, Jr.
patent: 3316410 (1967-04-01), Meili et al.
patent: 3409885 (1968-11-01), Hall
patent: 3460124 (1969-08-01), Smith et al.
patent: 3534351 (1970-10-01), Harnden, Jr. et al.
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3713128 (1973-01-01), Wong et al.
patent: 3728706 (1973-04-01), Tipton et al.
patent: 3774186 (1973-11-01), Enemark
patent: 3922655 (1975-11-01), Lecuyer

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