Smoke detector

Details Smoke detector Smoke detector

1976-01-07

1977-12-27

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

250574, 340249, G08B 1710

Patent

active

040657590

ABSTRACT:
A smoke detector working on the principal of interference of light between an L.E.D. source and a phototransistor receiver detects differences in smoke emission regardless of the color of the smoke. A pulsating power supply automatically turns the power to the unit on and off every thirty seconds so that the life of the unit is extended and energy is conserved. When a hazardous smoke condition exists, the unit produces rapidly interrupted alarm signals. A warning signal which is different than the alarm signal draws attention to an optoelectronic system malfunction or a power supply voltage drop below a preset level.

REFERENCES:
patent: 1256740 (1918-02-01), Steiger
patent: 3534351 (1970-10-01), Harnden, Jr. et al.
patent: 3659278 (1972-04-01), Jensen
patent: 3860919 (1975-01-01), Aker
patent: 3879717 (1975-04-01), Gruensfelder
patent: 3895367 (1975-07-01), Visser
patent: 3906473 (1975-09-01), Levine

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