Non-alterable magnetic coding

Details Non-alterable magnetic coding Non-alterable magnetic coding

1985-07-25

1987-01-27

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235436, 235493, 235494, G06K 708

Patent

active

046395849

ABSTRACT:
A card having an uninterrupted strip of magnetizable material affixed to the surface of a substrate can carry a machine readable code in the form of a magnetized pattern. By removing alternate magnetized segments, in a column of parallel rifts across the strip, the machines readable code becomes non-alterable, since a uniform, unidirectional magnetization of the remaining material restores the original code.

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