Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2011-03-01
2011-03-01
Bugg, George A (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S539230, C340S539210, C340S539150, C340S573100, C340S539130
Reexamination Certificate
active
07898414
ABSTRACT:
The invention is a system for locating and preventing the loss of personal items within a geographic zone. The system components are a personal portable homing center device a having a radio frequency receiver and a transducer that is actuated by a change in a signal strength; and several zone devices, for instance an active RFID tag attached to the personal item. The homing center device has an algorithm to measure the strength of the signal generated by the tag. The transducer is an audible and/or a silent alarm. The homing center device has three operating modes: Off, Homing-in, and Homing-out. In the Homing-in mode the alarm is actuated when a zone device's signal is detected. In the Homing-out operating mode the alarm is actuated when a zone device's signal falls to a threshold strength, indicating that the item is no longer close to the homing center device.
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Brockington F. Rhett
Bugg George A
Lau Hoi C
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