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US 4,025,673 AGranted
Method of forming copy resistant documents by forming an orderly array of fibers extending upward from a surface, coating the fibers and printing the coated fibers and the copy resistant document resulting from said method
OwnerRichard E. Reinnagelinventor
Life of this patent
Estimating the term…
Abstract
Methods for treating or producing original documents to inhibit, if not preclude, the reproduction of such documents by copying processes. The documents so produced favor the visual response of the human eye over the physical response of a copying machine so that the graphical information imprinted on the document background is readily perceptible by the human eye but imperceptible by the sensor and associated processes of a copying machine.
Claims3
A copy resistant document comprising:
- a sheet of material having an upper irregular surface comprised of a multiplicity of fibers extending upwardly from said sheet at angles less than 90.degree. relative to the plane of said sheet, said fibers having a coating of a colored material thereon applied by spraying at an angle corresponding to the angle at which said document would normally be viewed for reading by the human eye, and graphical information imprinted on said irregular surface to produce a document easily readable at said normal human eye viewing angle but unreadable when viewed perpendicularly to the plane of said document to create a useless image for reproduction by a copying machine.
A method of forming a document to resist reproduction by copying machines comprising:
- treating the upper surface of a black sheet of material to form surface irregularities thereon consisting of a multiplicity of fibers extending upwardly from said sheet generally at an angle less than 90.degree. relative to the plane of said sheet, coating said fibers by directing a spray of colored material thereon at an angle corresponding to the angle at which said sheet would normally be viewed for reading by the human eye, and printing graphical information on said surface irregularities to produce a document readable at typical human eye viewing angles, but unreadable when viewed perpendicularly to the plane of said sheet to create a useless image for reproduction by a copying machine.
Dependencies are inferred from the claim text.