Patent Document ID: 4033059
Application ID: 05569563
Patent Status: 1

Claim One:
1. A security document or the like, comprising: (a) a substrate having a surface; (b) an imprint comprising spaced pattern elements raised from said surface, said raised elements being inked with a color visibly contrasting with the intervening portions of said surface, said intervening portions being visible between said pattern elements when viewed along a line of sight perpendicular to said surface; (c) said imprint including at least one image array and a background array, each array comprising a multiplicity of said pattern elements; (d) said image array and said background array being respectively disposed, in relation to said surface, for occluding their respective intervening portions of the surface in distinctively different degrees as the imprint is viewed at an oblique angle in at least one plane normal to said surface, thereby to produce variation in contrast between said one image array and said background array as the angle of view of said imprint varies in said one plane normal to said surface, the image and background arrays being further respectively so disposed that said one image array blends substantially with said background array from one angle of view but appears in clear contrast to said background array from another angle of view in said plane.