Identification card bearing latent image perceptible in the pres

Details Identification card bearing latent image perceptible in the pres Identification card bearing latent image perceptible in the pres

1981-12-14

1983-12-13

Silverberg, Fred

Printed matter

Having revealable concealed information, fraud preventer or...

Identifier

40626, 283110, 283111, B42D 1500

Patent

active

044201745

ABSTRACT:
A latent image identification card has a translucent base with a multiplicity of engraved scores extending through a generally opaque top layer into the base layer whereby a "negative" image appears when the background light is below a determinable value and a latent, "positive" image appears when the background light passing through the translucent base is above the determinable value.

REFERENCES:
patent: 3871119 (1975-03-01), Mayer
patent: 3897964 (1975-08-01), Oka et al.
patent: 3919447 (1975-11-01), Kilmer, Jr. et al.
patent: 3930924 (1976-01-01), Oka et al.
patent: 3950608 (1976-04-01), Noda et al.
patent: 4052739 (1977-10-01), Wada et al.
patent: 4151666 (1979-05-01), Raphael et al.

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