Patent US5476830A successfully refreshed from Google Patents.
US5476830A
Expired / Lapsed
US
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Latent image printing substrate
Assignee: Nocopi International Inc
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Filing: 1994-08-10
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Granted: 1995-12-19
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Expires: 2014-08-10
Abstract
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.
Inventors
- 👤 Arshavir Gundjian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:38
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/48; B41M3/00; B41M3/14; B41M3/142; B41M5/124; B41M5/165; B41M5/24; B41M5/36; B41M1/00; B41M1/26; B41M1/34; B41M5/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A latent image printing substrate comprising: a surface having only two layers thereon consisting of a first layer of only one of a pair of a color developer and a color former dye, wherein the first layer is disposed on the surface where a latent image is to be formed and has a background color in conjunction with the surface and wherein the layer is reactive with the other of the pair when carried in a solvent to produce a spectral response which is visible relative to the background color and a continuous planar shielding layer disposed over the first layer where a latent image is to be formed, wherein the shielding layer is nonporous with respect to the other of the pair and solventresistant to the solvent carrying the other of the pair and wherein the shielding layer has a thickness of 0.1 to 10 microns and a melting point of from 50° to 200° C. to permit the selective permanent removal thereof in response to the application of thermal energy, whereby a latent image is formed.
Claim 2
Dependent Claim
178 words
A latent image printing substrate comprising: a surface having only two layers thereon consisting of a first layer of only one of a pair of a color developer and a color former dye, wherein the first layer is disposed on the surface where a latent image is to be formed and has a background color in conjunction with the surface and wherein the layer is reactive with the other of the pair when carried in a solvent to produce a spectral response which is visible relative to the background color and a continuous planar shielding layer disposed over the first layer where a latent image is to be formed, wherein the shielding layer is nonporous with respect to the other of the pair and solventresistant to the solvent carrying the other of the pair and wherein the shielding layer has a thickness of 0.1 to 10 microns and a melting point of from 50° to 200° C. to permit the selective permanent removal thereof in response to the application of thermal energy, whereby a latent image is formed.
Claim 3
Dependent Claim
13 words
The substrate according to claim 1, wherein the shielding layer includes a sensitizer.
Claim 4
Dependent Claim
23 words
The substrate according to claim 1, wherein the shielding layer forms a permanently open window in response to the application of thermal energy.
Claim 5
Dependent Claim
187 words
A latent image printing substrate comprising: a surface having only three layers thereon consisting of a first layer of only one of a pair of a color developer and a color former dye, wherein the first layer is disposed on the surface where a latent image is to be formed and has a background color in conjunction with the surface and wherein the layer is reactive with the other of the pair when carried in a solvent to produce a spectral response which is visible relative to the background color, a continuous planar shielding layer disposed over the first layer where a latent image is to be formed, wherein the shielding layer is non-porous with respect to the other of the pair and solvent-resistant to the solvent carrying the other of the pair and wherein the shielding layer has a thickness of 0.1 to 10 microns and a melting point of from 50° to 200° C. to permit the selective permanent removal thereof in response to the application of thermal energy, whereby a latent image is formed and a third layer of sensitizer on the shielding layer.
Claim 6
Dependent Claim
187 words
A latent image printing substrate comprising: a surface having only three layers thereon consisting of a first layer of only one of a pair of a color developer and a color former dye, wherein the first layer is disposed on the surface where a latent image is to be formed and has a background color in conjunction with the surface and wherein the layer is reactive with the other of the pair when carried in a solvent to produce a spectral response which is visible relative to the background color, a continuous planar shielding layer disposed over the first layer where a latent image is to be formed, wherein the shielding layer is non-porous with respect to the other of the pair and solvent-resistant to the solvent carrying the other of the pair and wherein the shielding layer has a thickness of 0.1 to 10 microns and a melting point of from 50° to 200° C. to permit the selective permanent removal thereof in response to the application of thermal energy, whereby a latent image is formed and a third layer of sensitizer on the shielding layer.
Claim 7
Dependent Claim
23 words
The substrate according to claim 4, wherein the shielding layer forms a permanently open window in response to the application of thermal energy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |