Security card with optical trace

Details Security card with optical trace Security card with optical trace

1997-05-27

2000-06-13

Evans, Elizabeth

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428402, 428692, 428913, 427157, 427162, 156 67, B32B 300

Patent

active

060747269

ABSTRACT:
A process for authenticating a medium which can be solid or liquid in which particles of an organic composition capable of absorbing or reflecting infrared or near-infrared radiation are incorporated in the medium. The transparent or opaque state can be irreversibly selected upon heating to a temperature greater than ambient temperature or to ultraviolet radiation and, whether or not particles are opaque can then be determined.

REFERENCES:
patent: 5232527 (1993-08-01), Vernhet

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