Documents of value printed to prevent counterfeiting
AssigneeAmerican Bank Note Company
InventorAnthony LaCapria
Life of this patent
Estimating the term…
Abstract
These documents of value are printed so as to prevent copying, and particularly the counterfeiting of documents of value, with the aid of modern color copiers. For that purpose, part of the material on the document is printed in an ink containing a specularly reflective coloring material, for example, powdered aluminum. The modern color copiers depend upon a color analysis of the light absorbed by various parts of the document, and do not reproduce true colors when they encounter specular reflections from the surface of the document being copied. A specular reflection on the surface of the document being copied results in a product from the color copier which does not faithfully follow the colors on the original document, and hence is readily distinguishable from an original.
Claims7
A document of value incapable of reproduction in true color by a color-analyzing-and-synthesizing copier, comprising:
- a. a printable substrate having two overlapping but non-registering imprints thereon;
- b. one of said imprints being in a color reproducible by said copier;
- and
- c. the other of said imprints being in an ink including a specularly reflective opaque coloring material, said other imprint being incapable of reproduction by said copier, said other imprint comprising:
- 1. a multiplicity of fine, closely spaced elements having a small dimension in at least one direction and thereby difficult to reproduce by hand;
- and
- 2. an area having dimensions in each of two mutually perpendicular directions which are substantially greater than said small dimension, said area being free of any overprint and thereby readily observable.
A document of value incapable of reproduction in true color by a color-analyzing-and-synthesizing copier, comprising:
- a. a printable substrate having two overlapping but non-registering imprints thereon;
- b. one of said imprints being in a color reproducible by said copier;
- and
- c. the other of said imprints being in an ink including a white metallic pigment having a luster incapable of reproduction by said copier, said other imprint comprising:
- 1. a multiplicity of fine, closely spaced elements having a small dimension in at least one direction and thereby difficult to reproduce by hand;
- and
- 2. an area having dimensions in each of two mutually perpendicular directions which are substantially greater than said small dimension, said area being free of any overprint and thereby readily observable.
A document of value incapable of reproduction in true color by a color-analyzing-and synthesizing copier, comprising:
- a. a printable substrate having two overlapping but non-registering imprints thereon;
- b. one of said imprints being in a color reproducible by said copier;
- and
- c. the other of said imprints being in an ink including a specularly reflective opaque coloring material and a fluorescent material incompletely masked by said reflective material and having fluorescent characteristics not reproducible by said copier, said reflective material having a color incapable of reproduction by said copier.
Dependencies are inferred from the claim text.