Personal alarm system

Details Personal alarm system Personal alarm system

1978-02-21

1980-02-19

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340164R, 340574, 325364, 325393, G08B 108, H04Q 700

Patent

active

041897218

ABSTRACT:
A personal alarm system includes a receiver with a relay; the relay has a pair of contacts which are normally open, and the contacts are closed on receipt of a signal received by the receiver. A warning device is connected to the relay contacts and is actuated upon closure of the relay contacts for sounding an audible alarm, so that a transmitter which transmits the signals to the receiver may actuate the warning device.

REFERENCES:
patent: 3111656 (1963-11-01), Barrett et al.
patent: 3249874 (1966-05-01), Weber
patent: 3604005 (1971-09-01), Gilmore
patent: 3611333 (1971-10-01), Conigliaro
patent: 3651507 (1972-03-01), Abbott

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