US3836244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color xerography
Assignee: Xerox Corp
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Filing: 1973-08-29
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Granted: 1974-09-17
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Expires: 1993-08-29
Abstract
Abstract A xerographic process in which an object is sequentially exposed through red, green, and blue filters and the resulting electrostatic images developed respectively with cyan, magenta, and yellow toners. Undesirable toner absorbances in other than their complementary colors are compensated for by selective removal or back transfer of toner from paper.
Inventors
- 👤 R Lehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A xerographic color process including the steps of: charging a xerographic photoreceptor with electrostatic charge, projecting an electrostatic image of an original object onto said photoreceptor by successive exposures through color filters, developing said electrostatic image by application thereto of successive toners in color complementary to the respective filters, applying an electrostatic transfer charge relative to a final image support means and said photoreceptor, transferring said developed image to said support means, repeating said charging step, repeating a projection step through a color filter to recreate an electrostatic image of the original on the photoreceptor, placing said photoreceptor and the undeveloped electrostatic image thereon in operative position relative to said support means and in registry with the developed image thereon, adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of the toner material.
Claim 2
Dependent Claim
142 words
A xerographic color process including the steps of: charging a xerographic photoreceptor with electrostatic charge, projecting an electrostatic image of an original object onto said photoreceptor by successive exposures through color filters, developing said electrostatic image by application thereto of successive toners in color complementary to the respective filters, applying an electrostatic transfer charge relative to a final image support means and said photoreceptor, transferring said developed image to said support means, repeating said charging step, repeating a projection step through a color filter to recreate an electrostatic image of the original on the photoreceptor, placing said photoreceptor and the undeveloped electrostatic image thereon in operative position relative to said support means and in registry with the developed image thereon, adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of the toner material.
Claim 3
Dependent Claim
28 words
A xerographic color process as defined in claim 1 wherein said color filters are red, green, and blue and said complementary toners are cyan, magenta, and yellow, respectively.
Claim 4
Dependent Claim
139 words
A xerographic color process including the steps of: a. charging a xerographic photoreceptor with electrostatic charge, b. projecting an electrostatic image of an original object onto said photoreceptor by exposure through a red color filter, c. developing said electrostatic image by application thereto of cyan toner, d. applying an electrostatic transfer charge relative to a final support means and said photoreceptor, e. transferring said developed image to said support means, f. repeating steps (a) through (e) with a green color filter and magenta toner, g. repeating steps (a) and (b), h. placing said photoreceptor and the undeveloped electrostatic image thereon in operative position relative to said support means and in registry with the developed image thereon, i. adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of said magenta toner.
Claim 5
Dependent Claim
139 words
A xerographic color process including the steps of: a. charging a xerographic photoreceptor with electrostatic charge, b. projecting an electrostatic image of an original object onto said photoreceptor by exposure through a red color filter, c. developing said electrostatic image by application thereto of cyan toner, d. applying an electrostatic transfer charge relative to a final support means and said photoreceptor, e. transferring said developed image to said support means, f. repeating steps (a) through (e) with a green color filter and magenta toner, g. repeating steps (a) and (b), h. placing said photoreceptor and the undeveloped electrostatic image thereon in operative position relative to said support means and in registry with the developed image thereon, i. adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of said magenta toner.
Claim 6
Dependent Claim
170 words
A xerographic color process including the steps of: a. charging a xerographic photoreceptor with electrostatic charge, b. projecting an electrostatic image of an original object onto said photoreceptor by exposure through a red color filter, c. developing said electrostatic image by application thereto of cyan toner, d. applying an electrostatic transfer charge relative to a final support means and said photoreceptor, e. transferring said developed image to said support means, f. repeating steps (a) through (e) with a green color filter and magenta toner, g. repeating steps (a) through (e) with a blue color filter and yellow toner, h. repeating step (a), i. projecting an electrostatic image of said original object onto said photoreceptor by exposure through said green color filter, j. placing said photoreceptor and the undeveloped electrostatic image thereon in operative pOsition relative to said support means and in registry with the developed image thereon, k. adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of said yellow toner.
Claim 7
Dependent Claim
170 words
A xerographic color process including the steps of: a. charging a xerographic photoreceptor with electrostatic charge, b. projecting an electrostatic image of an original object onto said photoreceptor by exposure through a red color filter, c. developing said electrostatic image by application thereto of cyan toner, d. applying an electrostatic transfer charge relative to a final support means and said photoreceptor, e. transferring said developed image to said support means, f. repeating steps (a) through (e) with a green color filter and magenta toner, g. repeating steps (a) through (e) with a blue color filter and yellow toner, h. repeating step (a), i. projecting an electrostatic image of said original object onto said photoreceptor by exposure through said green color filter, j. placing said photoreceptor and the undeveloped electrostatic image thereon in operative pOsition relative to said support means and in registry with the developed image thereon, k. adjusting the application of said electrostatic transfer charge to effect the removal from said support means of some of said yellow toner.
References Cited (Backward Citations)
US3583806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |