Patent ID: 6991260
Filing Date: 2006-01-31
Classification: B41M,B42D,Y10S,Y10T

Abstract:
1. A security feature for a document comprising a first pattern having a first partial image and a first background pattern, said first pattern being on a first surface of said document, and a second pattern having a second partial image and a second background pattern, said second pattern on a second surface of said document, said second surface of said document being opposite said first surface of said document, said document being sufficiently transparent wherein said first pattern and said second pattern are see-through such that said first pattern and said second pattern can be viewed at a substantially perpendicular angle, superimposed upon each other from said first surface of said document, wherein if said first pattern is aligned with said second pattern, said first partial image and said second partial image form a complete image, if said first pattern is misaligned with said second pattern, said complete image disappears, wherein lines in the first pattern and lines in the second pattern have substantially the same; and wherein the first pattern and the second pattern have tolerances of a fraction of a millimeter.