Latent image printing process and apparatus and substrate therefor
First Claim
Patent Images
1. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering has a melting point of from 50°
to 200°
C.
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Abstract
A latent image printing method and apparatus uses a substrate with one main surface having a covering comprising one of a first pair of a color developer and color former dye defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color and a continuous coating over the covering which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair. The coating above selected portions of the covering corresponding to a desired latent image is removed.
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Citations
20 Claims
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1. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering has a melting point of from 50°
to 200°
C.
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
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2. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering has a thickness on the order of 0.1 to 10 microns.
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
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3. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, further comprising a layer of sensitizer on the covering.
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
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4. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering includes a sensitizer.
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
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5. A latent image printing substrate comprising:
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering comprises microcapsules encapsulating the one of the pair and which are non-porous with respect to the other of the pair and have a melting point of between 50° and
200°
C.
- one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and
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6. A latent image printing process comprising the steps of:
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providing a substrate with one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color and a covering over said one of the pair which is non-porous with respect to the other of the first pair and solvent-resistant to the other of the pair; and removing selected portions of the covering corresponding to a desired latent image. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A latent image printing process comprising the steps of:
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providing a first substrate with one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color and a covering over said one of the pair which is non-porous with respect to the other of the first pair and solvent-resistant to the other of the pair; superposing a second substrate with one main surface onto the one main surface of the first substrate; and causing selected portions of the covering corresponding to a desired latent image to be transferred to the one main surface of the second substrate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification