Multi-subscriber alarm system with central receiving and transmi

Details Multi-subscriber alarm system with central receiving and transmi Multi-subscriber alarm system with central receiving and transmi

1975-02-14

1976-11-09

Waring, Alvin H.

Communications: electrical

Systems

Call station

340411, G08B 2500

Patent

active

039914127

ABSTRACT:
An alarm system for a number of individual subscribers connected to a central installation in which each subscriber can signal the central installation when help is needed and the central installation can signal back to the subscriber indicating receipt of the call. The subscriber can make further calls and receive signals from the central installation in return.
Alarm systems are known having multiple subscribers to a central processing station. These alarms are generally in use for burglar and fire protection. However, the equipment used in such installations are merely alarms from the subscriber to the station and do not have the possibility of a two-way contact between the individual subscribers and the central station.

REFERENCES:
patent: 3430218 (1969-02-01), Healey
patent: 3707708 (1972-12-01), Dan
patent: 3854127 (1974-12-01), Damon

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