Alarm devices for interconnected multi-device systems

Details Alarm devices for interconnected multi-device systems Alarm devices for interconnected multi-device systems

1978-12-11

1980-09-16

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340628, G08B 1700

Patent

active

042233038

ABSTRACT:
Alarm devices are provided with circuit means for permitting interconnection of the alarm devices into an alarm system in which each of the powered alarm devices continually senses for an adverse condition, such as smoke in a smoke detection alarm system, and in which all of the powered alarm devices signal an alarm in response to the sensing of an adverse condition by any one of the powered alarm devices.

REFERENCES:
patent: 2789282 (1957-04-01), Winters
patent: 3546692 (1970-12-01), Salzer
patent: 3778800 (1973-12-01), Blackwell et al.
patent: 3792279 (1974-02-01), Sasaki
patent: 3909813 (1975-09-01), Scheidweiler et al.
patent: 4030086 (1977-06-01), Salem
patent: 4141007 (1979-02-01), Kavasilios et al.

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