Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-10-07
1979-01-16
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
343 5PD, G08B 1318
Patent
active
041351851
ABSTRACT:
An RF intruder system utilizes two concentric loops of wire spaced apart for a predetermined magnitude, either of which can transmit and/or receive electromagnetic energy. This area within the loops are to be protected against intrusion. Without intrusion, the received signal is steady. Upon intrusion, there are signal changes which are instantly noted by signal detection and processing.
REFERENCES:
patent: 3696368 (1972-10-01), Kauffman
patent: 3794992 (1974-02-01), Gehman
Fante Ronald L.
Franchi Peter R.
Karas Nicholas V.
Poirier J. Leon
Rotman Walter
Fine George
Rusz Joseph E.
Swann III Glen R.
The United States of America as represented by the Secretary of
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