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United States of America Patent
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Nov 24, 1992
Issued Date -
N/A
app pub date -
Feb 16, 1990
filing date -
Feb 15, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A passive integrated transponder (PIT) is attached to or embedded in an item to be identified. It is excited via an inductive coupling from an interrogator. The PIT responds to the interrogator via the inductive coupling with a signal constituting a stream of data unique to the identified item. The signal is in the form of two different frequencies, a shift from one frequency to the second during a bit cell representing a data 'one', and a shift from the second frequency to the first frequency representing a data 'zero'. The responsive signal is then detected and processed for utilization in a data storage or display device.
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