Non-contact transaction system with token presence detection

Details Non-contact transaction system with token presence detection Non-contact transaction system with token presence detection

1992-03-31

1994-10-04

Willis, Davis L.

Registers

Coded record sensors

Particular sensor structure

G06K 708

Patent

active

053528778

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.

REFERENCES:
patent: 4870419 (1989-09-01), Baldwin et al.
patent: 4899036 (1990-02-01), McCrindle
patent: 5164732 (1992-11-01), Brockelsby et al.
patent: 5235326 (1993-08-01), Beigel et al.

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