Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1994-05-27
1995-10-24
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
34082549, 340573, G01S 502
Patent
active
054613906
ABSTRACT:
A locator device for monitoring the location of subjects, usable in conjunction with a database system connected to a wireless network, wherein the database system causes a polling signal to be sent periodically to each of the subject's locator devices in the area. The locator device includes a wireless transceiver to receive the polling message and, in response, query a location determination device for the current location of the device. This location is then sent back through the wireless network to the database. The database determines from a record on that particular subject where that subject is supposed to be at that time. If the subject being monitored is not within the area where he or she is supposed to be, then the database may automatically contact law enforcement officials.
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AT&T IPM Corp.
Ghose Mony R.
Johannesen Michael B.
Phan Dao L.
Tarcza Thomas H.
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