US4820618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a color proof by color electrostatography
Assignee: Stork Colorproofing BV
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Filing: 1986-10-17
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Granted: 1989-04-11
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Expires: 2006-10-17
Abstract
Abstract An emulsified polymer color toner in a liquid carrier is provided for application to a latent electrostatic image on an electrostatographic recording member and transferred to a receptor sheet. The color toner consists of a colorant and a polymeric binder. A polymer solvent is applied to the receptor sheet surface carrying the deposited toner layer to dissolve part of the binder sufficient to transparentize the color layer, glaze and to fuse the toner layer. The glazing, transparentizing and fusing is effected without increase in dot gain. The polymer dispersant is insoluble in the toner carrier. The polymer solvent is removed from the receptor sheet and the sheet can be polished after removal of the solvent.
Inventors
- 👤 Terence M. Lawson
- 👤 Gregory A. Quilliam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:17
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/20; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
The method of producing an electrostatographic color proof having substantially the same appearance as color prints printed by offset or gravure processes with regards to transparency and gloss of image areas relative to image-free areas, wherein said electrostatographic color proof comprises a receptor sheet containing on its surface image-free areas and image areas, said image areas consisting of color deposits in the form of at least one color layer, said method comprising the steps of: forming an image of electroscopic marking particles of appropriate color consisting of colorant and a polymeric binder for same to form said color deposit on said electrostatographic recording member; transferring said deposit of said appropriate color for a period of time sufficient to solvate from said electrostatographic recording member onto the receptor sheet, forming a continuum by applying a solvent to the surface of said receptor sheet, said binder in said electroscopic marking particles forming said color deposit thereon thereby to transparentize and increase the gloss of said color deposit without affecting the gloss of said receptor sheet in the image-free areas; and removing said solvent from said receptor sheet.
Claim 2
Independent Claim
185 words
The method of producing an electrostatographic color proof having substantially the same appearance as color prints printed by offset or gravure processes with regards to transparency and gloss of image areas relative to image-free areas, wherein said electrostatographic color proof comprises a receptor sheet containing on its surface image-free areas and image areas, said image areas consisting of color deposits in the form of at least one color layer, said method comprising the steps of: forming an image of electroscopic marking particles of appropriate color consisting of colorant and a polymeric binder for same to form said color deposit on said electrostatographic recording member; transferring said deposit of said appropriate color for a period of time sufficient to solvate from said electrostatographic recording member onto the receptor sheet, forming a continuum by applying a solvent to the surface of said receptor sheet, said binder in said electroscopic marking particles forming said color deposit thereon thereby to transparentize and increase the gloss of said color deposit without affecting the gloss of said receptor sheet in the image-free areas; and removing said solvent from said receptor sheet.
Claim 3
Dependent Claim
16 words
The method of producing an electrostatographic color proof according to claim 1, wherein said solvent dissolves.
Claim 4
Dependent Claim
21 words
The method of producing an electrostatographic color proof according to claim 1, wherein said solvent is sprayed on said receptor sheet.
Claim 5
Dependent Claim
27 words
The method of producing an electrostatographic color proof according to claim 1 and the step of removing said solvent from said receptor sheet by heat assisted evaporation.
References Cited (Backward Citations)
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |