Patent US5583678A successfully refreshed from Google Patents.
Patent US5600430A successfully refreshed from Google Patents.
US5600430A
Expired / Lapsed
US
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Split recharge method and apparatus for color image formation
Assignee: Xerox Corp
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Filing: 1994-11-30
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Granted: 1997-02-04
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Expires: 2014-11-30
Abstract
Abstract In a multi-color imaging apparatus utilizing a recharge step between two image creation steps for recharging a charge retentive surface to a predetermined potential pursuant to forming the second of the two images, a first corona generating device recharges the charge retentive surface to a higher absolute potential than a predetermined potential, and then a second corona generating device recharges the charge retentive surface to the predetermined potential. An electrical charge associated with the first image is substantially neutralized after being recharged by the first and second corona generating device.
Inventors
- 👤 Jeffrey J. Folkins
- 👤 Roger L. Bullock
- 👤 Thomas J. Fleck
- 👤 Kenneth W. Pietrowski
- 👤 Charles H. Tabb
- 👤 Zhao-Zhi Yu
- 👤 Mark A. Gwaltney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/0147; G03G15/0152; G03G15/0105; G03G15/0157; G03G15/0163; G03G2215/00; G03G2215/01; G03G2215/0167; G03G2215/0174
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
122 words
A corona generating apparatus for recharging a charge retentive surface to a predetermined potential, wherein the charge retentive surface has an image developed thereon having an electrical charge associated therewith, comprising: a first corona generating device, positioned adjacent the charge retentive surface, for recharging the charge retentive surface to a higher absolute potential than the predetermined potential; and a second corona generating device, spaced from said first corona generating device and positioned adjacent the charge retentive surface, for recharging the charge retentive surface to the predetermined potential, the difference in charge retentive surface potential after being recharged by said first corona generating device and the predetermined potential being preselected so as to substantially neutralize the electrical charge associated with the developed image.
Claim 2
Dependent Claim
122 words
A corona generating apparatus for recharging a charge retentive surface to a predetermined potential, wherein the charge retentive surface has an image developed thereon having an electrical charge associated therewith, comprising: a first corona generating device, positioned adjacent the charge retentive surface, for recharging the charge retentive surface to a higher absolute potential than the predetermined potential; and a second corona generating device, spaced from said first corona generating device and positioned adjacent the charge retentive surface, for recharging the charge retentive surface to the predetermined potential, the difference in charge retentive surface potential after being recharged by said first corona generating device and the predetermined potential being preselected so as to substantially neutralize the electrical charge associated with the developed image.
Claim 3
Dependent Claim
21 words
The corona generating apparatus according to claim 1, further comprising a direct current source coupled to said first corona generating device.
Claim 4
Dependent Claim
21 words
The corona generating apparatus according to claim 1, further comprising an alternating current source coupled to said second corona generating device.
Claim 5
Dependent Claim
29 words
The corona generating apparatus according to claim 3, wherein said second corona generating device comprises: an electrode; and a grid, interposed between said electrode and the charge retentive surface.
Claim 6
Dependent Claim
39 words
The corona generating apparatus according to claim 1, wherein the preselected difference in charge retentive surface potential, after being recharged by said first corona generating device and the predetermined potential, ranges from about 50 volts to about 350 volts.
Claim 7
Dependent Claim
39 words
The corona generating apparatus according to claim 1, wherein the preselected difference in charge retentive surface potential, after being recharged by said first corona generating device and the predetermined potential, ranges from about 75 volts to about 200 volts.
Claim 8
Dependent Claim
23 words
The corona generating apparatus according to claim 1, wherein said first corona generating device and said second corona generating device are voltage sensitive.
Claim 9
Dependent Claim
134 words
A printing machine, comprising: a charge retentive surface having a developed image thereon, the developed image having an electrical charge associated therewith; and a corona generating apparatus for recharging said charge retentive surface to a predetermined potential, said corona generating recharge device including: a first corona generating device, positioned adjacent said charge retentive surface, for recharging said charge retentive surface to a higher absolute potential than the predetermined potential; and a second corona generating device, spaced from said first corona generating device and positioned adjacent said charge retentive surface, for recharging said charge retentive surface to the predetermined potential, the difference in charge retentive surface potential after being recharged by said first corona generating device and the predetermined potential being preselected so as to substantially neutralize the electrical charge associated with the developed image.
Claim 10
Dependent Claim
134 words
A printing machine, comprising: a charge retentive surface having a developed image thereon, the developed image having an electrical charge associated therewith; and a corona generating apparatus for recharging said charge retentive surface to a predetermined potential, said corona generating recharge device including: a first corona generating device, positioned adjacent said charge retentive surface, for recharging said charge retentive surface to a higher absolute potential than the predetermined potential; and a second corona generating device, spaced from said first corona generating device and positioned adjacent said charge retentive surface, for recharging said charge retentive surface to the predetermined potential, the difference in charge retentive surface potential after being recharged by said first corona generating device and the predetermined potential being preselected so as to substantially neutralize the electrical charge associated with the developed image.
Claim 11
Dependent Claim
20 words
The printing machine according to claim 8, further comprising a direct current source coupled to said first corona generating device.
Claim 12
Dependent Claim
20 words
The printing machine according to claim 8, further comprising an alternating current source coupled to said second corona generating device.
Claim 13
Dependent Claim
28 words
The printing machine according to claim 10, wherein said second corona generating device comprises: an electrode; and a grid, interposed between said electrode and said charge retentive surface.
Claim 14
Dependent Claim
38 words
The printing machine according to claim 8, wherein the preselected difference in charge retentive surface potential, after being recharged by the first corona generating device and the predetermined potential, ranges from about 50 volts to about 350 volts.
Claim 15
Dependent Claim
38 words
The printing machine according to claim 8, wherein the preselected difference in charge retentive surface potential, after being recharged by the first corona generating device and the predetermined potential, ranges from about 75 volts to about 200 volts.
Claim 16
Dependent Claim
43 words
The printing machine according to claim 8, wherein the multiple images are created during one revolution of said charge retentive surface, further comprising means for developing each of the multiple images with a different color toner, whereby a composite color image is created.
Claim 17
Dependent Claim
24 words
The printing machine according to claim 14, wherein said developing means develops a first image of the multiple images with a black color toner.
Claim 18
Dependent Claim
22 words
The printing machine according to claim 8, wherein said first corona generating device and said second corona generating device are voltage sensitive.
Claim 19
Independent Claim
90 words
A method for creating multiple images, comprising: recording a latent image on a charge retentive surface; developing the latent image, the developed image having an electrical charge associated therewith; predetermining a surface potential for recharging the charge retentive surface and the developed image thereto; recharging the charge retentive surface with a first corona generating device to a higher absolute potential than the predetermined potential; recharging the charge retentive surface with a second corona generating device to the predetermined potential; and substantially neutralizing the electrical charge associated with the developed image.
Claim 20
Independent Claim
90 words
A method for creating multiple images, comprising: recording a latent image on a charge retentive surface; developing the latent image, the developed image having an electrical charge associated therewith; predetermining a surface potential for recharging the charge retentive surface and the developed image thereto; recharging the charge retentive surface with a first corona generating device to a higher absolute potential than the predetermined potential; recharging the charge retentive surface with a second corona generating device to the predetermined potential; and substantially neutralizing the electrical charge associated with the developed image.
Claim 21
Dependent Claim
31 words
The method according to claim 17, wherein the recharging of the charge retentive surface with a first corona generating device, further comprises delivering a direct current to the charge retentive surface.
Claim 22
Dependent Claim
31 words
The method according to claim 17, wherein the recharging of the charge retentive surface with a second corona generating device, further comprises delivering an alternating current to the charge retentive surface.
Claim 23
Dependent Claim
43 words
The method according to claim 17, wherein the recharging of the charge retentive surface with a second corona generating device comprises using a high voltage corona generating device including an electrode with a grid interposed between the electrode and the charge retentive surface.
Claim 24
Dependent Claim
45 words
The method according to claim 17, wherein said first mentioned recharging step recharges the charge retentive surface so that a difference between the charge retentive surface potential after the first recharging step and the predetermined potential ranges from about 50 volts to about 350 volts.
Claim 25
Dependent Claim
45 words
The method according to claim 17, wherein said first mentioned recharging step recharges the charge retentive surface so that a difference between the charge retentive surface potential after the first recharging step and the predetermined potential ranges from about 75 volts to about 200 volts.
Claim 26
Dependent Claim
20 words
The method according to claim 17, further comprising creating the multiple images during one revolution of the charge retentive surface.
Claim 27
Dependent Claim
27 words
The method according to claim 17, further comprising developing each of the multiple images with a different color toner, so that a composite color image is formed.
Claim 28
Dependent Claim
21 words
The method according to claim 24, further comprising developing the first one of the multiple images with a black color toner.
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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) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |