US3702483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color rendition method
Assignee: Xerox Corp
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Filing: 1970-12-23
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Granted: 1972-11-07
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Expires: 1990-12-23
Abstract
Abstract A simple xerographic color process is herein disclosed for reproducing functional color. An original, containing color information, is recorded on a charged photoreceptor so that each function color found in the original is registered thereon at a discrete charge density level. The plate is then transported through a developing station containing a plurality of developing units, the units being equal in number to the number of functional colors found in the original. Each developing unit has an electrical control means operatively associated therewith to control development whereby only color components recorded at or above a predetermined potential are developed within the unit. The recorded images are developed in a descending order of magnitude whereby different and distinct colors are produced for each color component recorded on the photoconductive element. The final color rendition is transferred, in a single operation, to a sheet of final support material.
Inventors
- 👤 Joseph Fantuzzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818; G03G15/01; G03G15/0105; G03G15/0121; G03G2215/00; G03G2215/01; G03G2215/0167; G03G2215/017; G03G2215/0187; G03G2215/04; G03G2215/0495; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0619; G03G2215/0634; G03G2215/0636; G03G2215/0641; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
25 words
The method of claim 1 wherein each developed colorant is arranged to subtractively mix with other subsequently developed colorants to produce a predetermined resultant color.
Claim 2
Dependent Claim
31 words
The method of claim 1 further including the step of simultaneously transferring the developed color components of the latent image to a final support material subsequent to the last development sequence.
Claim 3
Dependent Claim
26 words
The method of claim 3 further including the step of fixing the simultaneously transferred developed color components of the latent image to the final support material.
Claim 4
Dependent Claim
168 words
Apparatus of the type wherein a latent electrostatic image formulated on an image retaining element is developed by bringing oppositely charged electroscopic marking particles of the same polarity into operative communication with said element, the apparatus including means to form an electrostatic latent image to record input scene information on said image retaining element comprising more than one color component recorded at discrete potential levels of the same polarity, a plurality of developing units, each unit being arranged to sequentially act upon the image retaining member to bring into operative communication therewith electroscopic marking powder of the same charge polarity containing a predetermined colorant corresponding to each color component and means to electrically regulate each developing unit to allow toner brought into operative association with said image retaining element to be attracted into those image regions recorded at or above a predetermined potential and to preclude the toner from being attracted into other regions whereby each recorded color component is developed to render a different and discrete color.
Claim 5
Dependent Claim
31 words
The apparatus of claim 5 wherein the developing units are arranged to subtractively mix the colorants to produce predetermined color in the composite image formed by the plurality of color components.
Claim 6
Dependent Claim
24 words
The apparatus of claim 5 further including means to simultaneously transfer the developed color components of the latent image to a final support material.
Claim 7
Dependent Claim
19 words
The apparatus of claim 7 further including means to fix the transfer color images to the final support material.
Claim 8
Dependent Claim
137 words
In a xerographic reproducing apparatus of the type having means to uniformly charge the surface of a moving photoconductive member to a uniform potential, the apparatus further including means to expose the charged photoconductive member to a light image to record latent electrostatic images thereon at least at two discrete potential levels of the same polarity, first developing means to develop the latent electrostatic images recorded at the higher of the two potential levels to the exclusion of those images recorded at the lower potential levels using a first toner of like charge polarity containing a first colorant, and second developing means to develop those images recorded at said lower potential level in the presence of the previoUsly developed images using a second toner of the same charge polarity as said first toner containing a second colorant.
Claim 9
Dependent Claim
90 words
The apparatus of claim 9 wherein said fist and second developing means include a donor member uniformly coated with electroscopic marking particles and being arranged to move in close proximity with the image retaining element whereby the particles are transferred from said donor member to the imaged regions on said element, and biasing means associated with said donor member to electrically regulate the development process to allow toner brought into operative association with said image retaining element to be attracted into imaged regions recorded at or above a predetermined potential.
Claim 10
Dependent Claim
30 words
The apparatus of claim 10 wherein said donor member of the first developing means is biased to a potential in a range between the first and second image recorded potential.
Claim 11
Dependent Claim
38 words
The apparatus of claim 11 wherein the donor member associated with said second developing means is biased to a potential between the background potential and the image potential of the lowest recorded image on said image retaining element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |