Flash imaging and voidable articles
DCFirst Claim
Patent Images
1. A voidable article comprising:
- a printed surface;
a machine readable identification code on an area of said printed surface;
a material, peculiarly responsive to a particular form of radiant energy not normally present in ambient light in amounts sufficient to cause said material to discolor, positioned on said printed surface in the area of said machine readable code, said material making said code unreadable after being exposed to said particular form of radiant energy.
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Accused Products
Abstract
Voidable articles are made with an identification code and a radiant energy responsive material coated over said code. The material is invisible and remains unactivated in ambient light but obscures the identification code upon being exposed to radiant energies such as heat or light from within a particular wavelength range. Printing can be accomplished by imaging light onto a substrate coated with photosensitive material including an infrared absorbing dye. A cancellation device for voiding documents of the present invention is made with a scanner, a comparator and a radiant energy source for exposing the document to activate the energy responsive material on the document.
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Citations
35 Claims
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1. A voidable article comprising:
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a printed surface; a machine readable identification code on an area of said printed surface; a material, peculiarly responsive to a particular form of radiant energy not normally present in ambient light in amounts sufficient to cause said material to discolor, positioned on said printed surface in the area of said machine readable code, said material making said code unreadable after being exposed to said particular form of radiant energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A voidable document comprising:
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a document; a machine readable code on an area of said document; an invisible photoresponsive material unresponsive to ambient light, located on said document so that upon being exposed to a sufficient intensity of non-visible wavelength light to activate said photoresponsive material, a visible marking appears on said document, wherein said sufficient intensity of non-visible wavelength light is an intensity for said non-visible wavelength light greater than is normally present in ambient light. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 35)
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24. A device for invalidating articles comprising:
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a scanner capable of reading a machine readable code on an article; comparator means for receiving a signal from said scanner representative of said machine readable code and for generating a validity signal indicating whether said article has met a validity criteria; and a radiant energy source which exposes at least a portion of said article to a dose of radiant energy in response to a validity signal from said comparator means, said radiant energy causing a marking to appear on said article thereby invalidating said article. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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- 31. A method for printing comprising flashing light in selected fiber optic bundles from an array of said bundles to form a desired pattern on a surface coated with a photosensitive material and an infra-red absorbing dye.
Specification