Patent ID: 6318759
Filing Date: 2001-11-20
Classification: B42D

Abstract:
A security document comprising a security image comprising primary and secondary security image portions defined on a face of said security document, wherein:said primary security image portion is defined by security image elements of a first color;said secondary security image portion is defined by security image elements of a second color;said primary security image portion and said secondary security image portion are superposed to form said security image;said primary security image portion comprises first and second pluralities of security image segments;each of said first plurality of security image segments of said primary security image portion includes security image elements printed such that a tone of said security image elements of said first plurality of security image segments graduates in a first direction;each of said second plurality of security image segments of said primary security image portion includes security image elements printed such that a tone of said security image elements of said second plurality of security image segments graduates in a second direction distinct from said first direction;said secondary security image portion comprises first and second pluralities of security image segments;each of said first plurality of security image segments of said secondary security image portion includes security image elements printed such that a tone of said security image elements of said first plurality of security image segments graduates in said first direction; andeach of said second plurality of security image segments of said secondary security image portion includes security image elements printed such that a tone of said security image elements of said second plurality of security image segments graduates in said second direction distinct from said first direction.