Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1985-09-19
1986-09-09
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340531, 340536, G08B 108
Patent
active
046111980
ABSTRACT:
A security and communication system permits the location of signaling portable radio frequency transmitters which may be carried by individuals. If an individual signals with his portable frequency transmitter, a first signal is sent including a first individual identification code to identify the particular portable transmitter. The first signal is picked up by at least one of a plurality of radio frequency relays each positioned in a predetermined location. Such relays immediately transmit a second signal including the first identification code and also a second identification code to identify the individual relay that is transmitting the second signal. Thus the signal sent by the individual relay identifies the location and the specific identity of the particular portable radio frequency transmitter which is sending the signal.
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Linear Alert, ET-1 and DX-12 catalog sheets, Linear Security Products Group, 1983.
Caldicott Jack R.
Levinson Samuel H.
Crosland Donnie L.
Gerstman George H.
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