US4121932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process involving dye transfer imagewise
Assignee: Panasonic Holdings Corp
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Filing: 1977-04-06
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Granted: 1978-10-24
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Expires: 1997-04-06
Abstract
Abstract An electrophotographic process of forming a dye image comprising the steps of: (1) charging a photosensitive element formed on an electroconductive support by electrical charging, said photosensitive element consisting essentially of photoconductive particles and sublimable dyes, (2) exposing the charged photosensitive element to a light image, (3) developing the photosensitive element with acidic toners, (4) heating the photosensitive element to sublime the sublimable dyes, and (5) transferring the dye images to a dye-image accepting substrate with the aid of solvents. An electrophotographic material comprising an electroconductive support and a photosensitive element (i.e., photoconductive layer) formed thereon, said photosensitive element consisting essentially of photoconductive powders and sublimable dyes.
Inventors
- 👤 Eisuke Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/12; G03G13/00; G03G13/01; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
An electrophotographic process of forming a dye image comprising the steps of: (1) charging a photosensitive element formed on an electroconductive support by electrical charging, said photosensitive element consisting essentially of a mixture of photoconductive powders and sublimable dyes, (2) exposing the charged photosensitive element to a light image to form an electrostatic latent image, (3) developing the photosensitive element with an acidic toner, (4) heating the photosensitive element to form a dye image, and (5) transferring the dye image to a dye image-accepting substrate with the aid of a solvent.
Claim 2
Dependent Claim
91 words
An electrophotographic process of forming a dye image comprising the steps of: (1) charging a photosensitive element formed on an electroconductive support by electrical charging, said photosensitive element consisting essentially of a mixture of photoconductive powders and sublimable dyes, (2) exposing the charged photosensitive element to a light image to form an electrostatic latent image, (3) developing the photosensitive element with an acidic toner, (4) heating the photosensitive element to form a dye image, and (5) transferring the dye image to a dye image-accepting substrate with the aid of a solvent.
Claim 3
Dependent Claim
14 words
An electrophotographic process according to claim 1 wherein sublimable dyes are sublimable leuco dyes.
Claim 4
Dependent Claim
20 words
An electrophotographic process according to claim 1 wherein the dye image-accepting substrate contains a solvent which can dissolve the dye.
Claim 5
Dependent Claim
18 words
An electrophotographic process according to claim 3 wherein the solvent is water or a solvent soluble in water.
Claim 6
Dependent Claim
60 words
An electrophotographic process according to claim 1 wherein the photosensitive element comprises at least two kinds of color-producing photosensitive particles, said color-producing photosensitive particles consisting essentially of a photoconductive powder, 0.0001 to 2 percent by weight of a sensitizer and 0.5 to 15 percent by weight of a sublimable dye, said percentages being based on the amount of photoconductive powder.
Claim 7
Dependent Claim
142 words
An electrophotographic process according to claim 1 wherein the photosensitive element comprises three kinds of color-producing photosensitive particles, said color-producing photoconductive particles consisting of: (1) color-producing photosensitive particles consisting essentially of a photoconductive powder, 0.0001 to 2 percent by weight of a sensitizer absorbing blue-violet light and 0.5 to 15 percent by weight of a sublimable yellow color dye, (2) color-producing photosensitive particles consisting essentially of a photoconductive powder, 0.0001 to 2 percent by weight of a sensitizer absorbing green light and 0.5 to 15 percent by weight of a sublimable magenta color dye, and (3) color-producing photosensitive particles consisting essentially of a photoconductive powder, 0.0001 to 2 percent by weight of a sensitizer absorbing red light and 0.5 to 2% by weight of a sublimable cyan color dye, (4) said percentages being based on the amount of the respective photoconductive powders.
Claim 8
Dependent Claim
47 words
An electrophotographic process according to claim 6 wherein sublimable leuco dyes are used as the sublimable dyes, said sublimable leuco dyes being (1) a sublimable leuco dye producing yellow color, (2) a sublimable leuco dye producing magenta color, and (3) a sublimable leuco dye producing cyan color.
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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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |