Non-contact transaction system with token presence detection
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United States of America Patent
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-
Oct 4, 1994
Issued Date -
N/A
app pub date -
Mar 31, 1992
filing date -
Apr 1, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transaction system includes a portable electronic token and an external read/write unit which communicate by inductive coupling. The read/write unit transmits short pulses of an r.f. carrier when in its dormant or stand-by mode and, upon detecting the presence of a token, switches its r.f. on continuously to power up the token and conduct a transaction. Thus, the system conserves power but can react rapidly when a transaction is necessary.
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