Chromogenic media responsive to environmental conditions
First Claim
Patent Images
1. A medium capable of developing a latent image comprising:
- a substrate having a surface, wherein said surface includes a first chromogenic material providing a first image, said first image being rendered irreversibly illegible upon exposure to an environmental condition; and
a second chromogenic material capable of providing a secondary image wherein said secondary image is capable of developing upon exposure to said environmental condition from which said first image is rendered irreversibly illegible.
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Abstract
The present invention relates to chromogenic material that may respond and shift in color due to environmental conditions such as heat, light or humidity. The light may include both visible and non-visible light, such as ultraviolet light. The chromogenic material may therefore provide a method to independently develop a latent image on a given substrate, and in particular, to a substrate that includes conventional thermosensitive image forming media.
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Citations
24 Claims
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1. A medium capable of developing a latent image comprising:
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a substrate having a surface, wherein said surface includes a first chromogenic material providing a first image, said first image being rendered irreversibly illegible upon exposure to an environmental condition; and a second chromogenic material capable of providing a secondary image wherein said secondary image is capable of developing upon exposure to said environmental condition from which said first image is rendered irreversibly illegible. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of developing a latent image upon exposure to an environmental condition, comprising:
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providing a substrate having a surface, wherein said surface contains a first chromogenic material capable of forming a first image; applying a second chromogenic material wherein said second chromogenic material is capable of forming a secondary image upon exposure to an environmental condition, wherein said environmental condition which forms said second image renders said first image irreversibly illegible.
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18. A medium capable of developing a latent image comprising:
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a substrate having a surface, wherein said surface includes a first material providing a first image, said first image being rendered irreversibly illegible upon exposure to an environmental condition; and a second material capable of providing a secondary image, wherein said secondary image developing upon exposure to said environmental condition from which said first image is rendered irreversibly illegible, at least one of said first material and said second material comprising chromogenic material. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification