Security document and system

Details Security document and system Security document and system

1979-05-31

1980-10-14

Cook, Daryl W.

Registers

Coded record sensors

Particular sensor structure

235493, 360 2, 360 18, 360 25, 360 57, G06K 708, G06K 1906, G11B 2504, G11B 502

Patent

active

042283485

ABSTRACT:
A magnetizable anisotropic material layer having a pattern of regions of differently aligned material has an initial pattern of remanent magnetization, when manufactured by applying directional magnetic fields. This pattern is not easily restored, and is generally impossible to restore, after demagnetization or remagnetization. By preserving the residual pattern and selectively removing it in use by the application of a magnetic field, a security feature is provided. A secure document system using such a feature is provided.

REFERENCES:
patent: 3562635 (1971-02-01), Parker
patent: 3627934 (1971-12-01), Riddle
patent: 3812529 (1974-05-01), Yoichi
patent: 3873975 (1975-03-01), Miklos et al.
patent: 3878367 (1975-04-01), Fayling et al.
patent: 3895220 (1975-07-01), Nelson et al.
patent: 3927393 (1975-12-01), Fayling
patent: 3986205 (1976-10-01), Fayling
patent: 4023204 (1977-05-01), Lee
patent: 4024379 (1977-05-01), Pfost et al.

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