Latching alarm smoke detector

Details Latching alarm smoke detector Latching alarm smoke detector

1978-03-13

1980-03-11

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, G08B 1710, G01N 2128

Patent

active

041930690

ABSTRACT:
An optical smoke detector with a clock pulsed light source and photodiodes responding to smoke scattered light includes an alarm initiating logic circuit which delays the initiating of alarm while several samplings of smoke are sensed and then latches the logic circuit in alarm condition.

REFERENCES:
patent: 3946241 (1976-03-01), Malinowski

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