Calling aids

Details Calling aids Calling aids

1975-04-02

1977-11-08

Habecker, Thomas B.

Communications: electrical

Systems

Nonselective paging

174 67, 200333, 325118, 325119, H04M 1102

Patent

active

040577945

ABSTRACT:
A pocket-size portable transmitter in an emergency call transmission system for geriatric persons has an actuator including a simple switch part such as a push button and a simple cover part movable between a normal closed position covering the switch to prevent accidental actuation and an open position exposing the switch for actuation. In a preferred system a plurality of transmitters are inductively coupled with respective receivers distributed to determine separate areas for use of the transmitters, the transmitters producing multi-element code sequence signals to avoid false alarms from outside interference, and the receivers having wired connections to a central alarm indicator assembly.

REFERENCES:
patent: 2565523 (1951-08-01), Russell
patent: 3296404 (1967-01-01), Stevens
patent: 3493934 (1970-02-01), French
patent: 3623064 (1971-11-01), Kagan

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