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United States of America Patent
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Jun 20, 2000
Issued Date -
N/A
app pub date -
Jul 7, 1998
filing date -
Jul 7, 1997
priority date (Note) -
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Abstract
A very low power receiver and a transmitter are integrated on one silicon chip, thereby achieving a significant miniaturization of the tag with a long life time, and at the same time offering a significant reduction in unit price, despite requiring the use of a battery. The use of a backup battery helps overcome the range problem, the high cost of the reader, and the environmental problems associated with the emission of very strong magnetic fields.
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