Method of identifying a data carrier
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United States of America Patent
Stats
-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Dec 8, 1998
filing date -
Jan 25, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of identifying a data carrier such as a credit card, benefit card, access control card, identity card or stored value card, carrying data in the form of a plurality of rational number in a sequence, successive numbers having a marker between them, comprises a) measuring the distance from a fixed point on the data carrier to a given part of a marker, b) dividing this distance by the distance between corresponding give parts of successive markers, thereby obtaining a rational number, and c) subtracting this rational number from the number in the sequence adjacent the marker in a given direction, thereby obtaining a further rational number which is capable of identifying the data carrier uniquely.
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