Optical smoke detector

Details Optical smoke detector Optical smoke detector

1978-08-21

1980-04-22

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, G08B 1710

Patent

active

041997557

ABSTRACT:
An optical smoke detector having a light source and a light detector with the light detector shielded from direct light from the source. The light source is energized by a pulse generator and the outputs of the pulse generator and the light detector are fed through electric circuitry to produce one type of signal when the device operates normally and detects smoke and another type of signal should the detector fail to function in a normal manner.

REFERENCES:
patent: 2877453 (1959-03-01), Mendenhall, Jr.
patent: 3316410 (1967-04-01), Meili et al.
patent: 3474435 (1969-10-01), White et al.
patent: 3510666 (1970-05-01), Topol
patent: 3534351 (1970-10-01), Harnden, Jr. et al.
patent: 3543260 (1970-11-01), Engh
patent: 3710365 (1973-01-01), Barnes
patent: 3922655 (1975-11-01), Lecuyer
patent: 4149162 (1979-04-01), Enemark et al.

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