Identification card with hallmark for authentication by incident

Details Identification card with hallmark for authentication by incident Identification card with hallmark for authentication by incident

1981-05-13

1983-10-04

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Having plastic laminate

283111, B42D 1502, G09F 302

Patent

active

044075251

ABSTRACT:
An identification card constructed of several film layers is provided with a monochrome or polychrome printed pattern. The printed pattern consists of partially overlapping color layers placed over each other and distributed over the surfaces of the film layers.
The resulting printed pattern exhibits shadow effects in incident light which are reversed in transmitted light. A certain spatial effect and definite half-tone grading of the printed pattern can be achieved by the number and arrangement of the various printed layers.

REFERENCES:
patent: 2110500 (1938-03-01), Chiera
patent: 2506153 (1950-05-01), Hurley
patent: 3414998 (1968-12-01), Berger
patent: 3802101 (1974-04-01), Scantlin
patent: 3897964 (1975-08-01), Oka et al.
patent: 3930924 (1976-01-01), Oka et al.
patent: 4066280 (1978-01-01), LaCapria
patent: 4079673 (1978-03-01), Bernstein
patent: 4124947 (1978-11-01), Kuhn et al.
patent: 4307899 (1981-12-01), Hoppe

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