Patent US4093457A successfully refreshed from Google Patents.
US4093457A
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US
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Method of transfer
Assignee: Xerox Corp
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Filing: 1976-06-10
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Granted: 1978-06-06
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Expires: 1996-06-10
Abstract
Abstract A color process in which color copies of an original document containing color information are reproduced. Successive single color electrostatic latent images are developed with particles having a predetermined triboelectric charge thereon. These particles are transferred from the single color electrostatic latent images to a sheet of support material in a prescribed sequence. The sequence of transfer is such that each successive layer of toner particles transferred to the sheet of support material has a lesser triboelectric charge thereon than the preceeding layer transferred thereto. In this manner, back transfer from the sheet of support material to the electrostatic latent image is minimized.
Inventors
- 👤 Oscar G. Hauser
- 👤 Kallis H. Mannik
- 👤 Charles A. Whited
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:27
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/14; G03G13/16; G03G13/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A method of producing a copy, including the steps of: recording successive electrostatic latent images on a member; developing each successive electrostatic latent image with particles having differing triboelectric charges; and transferring the particles from the successive electrostatic latent images to a sheet of support material in a pre-determined sequence wherein each successive layer of particles transferred to the sheet of support material has a decreasing triboelectric charge, thereby minimizing back transfer from the sheet of support material to the electrostatic latent image.
Claim 2
Independent Claim
83 words
A method of producing a copy, including the steps of: recording successive electrostatic latent images on a member; developing each successive electrostatic latent image with particles having differing triboelectric charges; and transferring the particles from the successive electrostatic latent images to a sheet of support material in a pre-determined sequence wherein each successive layer of particles transferred to the sheet of support material has a decreasing triboelectric charge, thereby minimizing back transfer from the sheet of support material to the electrostatic latent image.
Claim 3
Dependent Claim
35 words
A method as recited in claim 1, wherein each transferred layer of particles is of a different color wherein the colors are arranged to mix subtractively with one another to produce a pre-determined resultant color.
Claim 4
Dependent Claim
22 words
A method as recited in claim 1, further including the step of fixing the transferred particles to the sheet of support material.
Claim 5
Dependent Claim
79 words
A method as recited in claim 1, wherein the step of recording includes the steps of: charging at least a portion of a photoconductive member; creating a light image of the original document to be reproduced; filtering the light image to create successive single color light images containing a discrete color of the original document; and projecting successive single color light images onto the charged portion of the photoconductive member to record successive single color electrostatic latent images thereon.
Claim 6
Dependent Claim
58 words
A method as recited in claim 4, wherein said step of developing includes the step of depositing on each single color electrostatic latent image particles containing a color complementary in color to the color of the single color light image projected onto the charged photoconducitve member for rendering visible the corresponding single color electrostatic latent image recorded thereon.
References Cited (Backward Citations)
US3815988A
Cited
US3909259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |