Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1986-08-20
1989-09-26
Trafton, David L.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235454, 235494, 235437, G06F 708
Patent
active
048702609
ABSTRACT:
The present invention is a method and apparatus for validating a valuable document such as a debit card. The valuable document includes a plurality of value markings arranged to form a code word. Illustratively, the value markings may be optical elements capable diffracting incident optical radiation. Alternatively, the value marking may be electrical elements such as safety fuses, diodes or transistors, the presence or absence of the electrical element representing a logic "1" or logic "0" respectively.
In accordance with the present invention, the code word is first read to determine if it is valid. If the code word is valid, one or more value markings are erased, in each of plurality of erasing steps, until, illustratively after the final erasing step all of the value markings are erased. After each erasing step, the erased and remaining unerased validations markings form a new code word. If the sequence of new code words corresponds to a predetermined sequence of code words a signal is produced. Illustratively, the signal corresponds to a cash value represented by the predetermined sequence of code words.
REFERENCES:
patent: 3702464 (1972-11-01), Castrucci
patent: 4172554 (1979-10-01), Clarinval et al.
patent: 4211918 (1980-07-01), Nyfeler et al.
patent: 4231458 (1980-11-01), Limone et al.
Greenaway David
Niepolomski Andrzej
LGZ Landis & Gyr Zug AG
Trafton David L.
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