Coded electronic security system

Details Coded electronic security system Coded electronic security system

1975-07-31

1978-06-13

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340164R, 340167R, 340171R, 325 38R, 325 40, 325 55, 325141, 325325, G08B 108

Patent

active

040952118

ABSTRACT:
The present invention pertains to a coded electronic security system which includes a plurality of independent transmitting devices, each of which transmits a radio frequency signal at the same frequency. Each transmitter includes a unique modulator which "keys" it at a frequency which corresponds solely to that particular transmitter. One or more remotely located receivers is adapted to receive and decode the signal generated by any of the transmitters and to indicate which of the transmitters has been activated.

REFERENCES:
patent: 2991357 (1961-07-01), True
patent: 3316488 (1967-04-01), Reynolds
patent: 3339141 (1967-08-01), Rothenbuhler
patent: 3510777 (1970-05-01), Gordon
patent: 3568154 (1971-03-01), Sills
patent: 3629837 (1971-12-01), Fraunfelder
patent: 3689888 (1972-09-01), Wooton
patent: 3747108 (1973-07-01), Rinser
patent: 3846705 (1974-11-01), Davis
patent: 3852713 (1974-12-01), Roberts et al.
patent: 3855575 (1974-12-01), Leuschner et al.
patent: 3898574 (1975-08-01), Allen et al.

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