Codeable identifying tag and method of identification thereof
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United States of America Patent
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-
Feb 24, 1987
Grant Date -
N/A
app pub date -
Aug 12, 1983
filing date -
Aug 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tag is receptive of two radio frequencies (RF signals) for mixing the two frequencies and radiating a signal which is either or both the sum and difference of the two RF frequencies. A uniquely identifiable tag includes, in addition to the mixer one or more filters for radiating a signal only when the sum or difference of the two signals is a pre-specified value or only when the RF signals are each of pre-selected values.
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