Communications: electrical – Continuously variable indicating – With meter reading
Patent
1995-05-09
1998-01-13
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34082531, 34082534, 340572, H04Q 100
Patent
active
057084238
ABSTRACT:
A data processing system automatically maintains records of respective locations of a plurality of objects in real time. Each of the objects has secured thereto a respective object marker which transmits an identification signal that is unique to the respective object. Sensor devices are installed at respective doorways of a building. Each sensor device receives the identification signal transmitted from the object marker as the respective object is moved through the doorway. The sensor device detects from the identification signal a direction in which the object is being moved through the doorway and generates a detection signal indicative of the detected direction of movement and also indicative of the identification signal for the object. The data processing system receives the detection signals from the sensor devices and maintains a data record with respect to each of the objects indicating the present location in the building of each of the objects.
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Texas Instruments, TIRIS Automatic Radio Frequency Identification System, 1994.
Ghaffari Touraj
Grimes Mark
Romer Kevin D.
Sensormatic Electronics Corporation
Zimmerman Brian
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