US5049949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension of tri-level xerography to black plus 2 colors
Assignee: Xerox Corp
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Filing: 1989-06-29
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Granted: 1991-09-17
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Expires: 2009-06-29
Abstract
Abstract Highlight color printing apparatus and method for forming one black and two color images. A tri-level image containing CAD and DAD image areas and a background area is formed. A second DAD image is formed by discharging the background area forming part of the tri-level image.
Inventors
- 👤 Delmer G. Parker
- 👤 Jerome E. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:15
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/0147; G03G15/0152; G03G13/00; G03G13/01; G03G15/0163
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
74 words
A method of creating toner images on a charge retentive surface, said method including the steps of: uniformly charging said charge retentive surface; exposing said uniformly charged surface to form a tri-level latent image comprising a charged-area image, a discharged-area image and a background area; using toner particles, developing one of said images; modifying said background area to form another image; using toner particles, developing said another image; developing the other of said images.
Claim 2
Independent Claim
74 words
A method of creating toner images on a charge retentive surface, said method including the steps of: uniformly charging said charge retentive surface; exposing said uniformly charged surface to form a tri-level latent image comprising a charged-area image, a discharged-area image and a background area; using toner particles, developing one of said images; modifying said background area to form another image; using toner particles, developing said another image; developing the other of said images.
Claim 3
Dependent Claim
25 words
The method according to claim 1 wherein the step of developing one of said images comprises developing the discharged-area image of said tri-level latent image.
Claim 4
Dependent Claim
20 words
The method according to claim 1 wherein said step of modifying comprises discharging said background area to form another image.
Claim 5
Dependent Claim
25 words
The method according to claim 3 wherein the step of developing one of said images comprises developing the discharged-area image of said tri-level latent image.
Claim 6
Dependent Claim
21 words
The method according to claim 4 wherein the step of developing said other of said images comprises developing said charge-area image.
Claim 7
Dependent Claim
82 words
Apparatus for creating multiple color images, said apparatus comprising: a charge retentive surface; means for uniformly charging said charge retentive surface; exposure means for forming a tri-level image on said charge retentive surface, said tri-level image including at least one DAD image, at least one CAD image and background areas; means for developing one of said images; means for modifying said background areas for forming another image; means for developing said another image; and means for developing the other of said images.
Claim 8
Dependent Claim
82 words
Apparatus for creating multiple color images, said apparatus comprising: a charge retentive surface; means for uniformly charging said charge retentive surface; exposure means for forming a tri-level image on said charge retentive surface, said tri-level image including at least one DAD image, at least one CAD image and background areas; means for developing one of said images; means for modifying said background areas for forming another image; means for developing said another image; and means for developing the other of said images.
Claim 9
Dependent Claim
25 words
Apparatus according to claim 6 wherein said means for developiong one of said images develops said DAD image with a toner of a first color.
Claim 10
Dependent Claim
28 words
Apparatus according to claim 7 wherein said means for modifying said background areas comprises means for discharging said background areas in accordance with an image to be formed.
Claim 11
Dependent Claim
33 words
Apparatus according to claim 8 wherein said means for developing said another image comprises a developer housing containing toner which is a different color from said toner used to develop said DAD image.
Claim 12
Dependent Claim
22 words
Apparatus according to claim 9 wherein said means for developing said other of said images comprises a developer housing containing black toner.
Claim 13
Dependent Claim
63 words
Apparatus according to claim 10 wherein said tri-level image forming means comprises means for developing one of said images, means for modifying said background areas, means for developing said another image and said means for developing the other of said images are arranged about said charge retentive surface such that a portion of said charge retentive surface is moved therepast in that order.
Claim 14
Independent Claim
84 words
A method of creating toner images on a charge retentive surface, said method including the steps of: uniformly charging said charge retentive surface; exposing said uniformly charged surface to form a tri-level latent image comprising a charged-area image, a discharged-area image and a background area; using toner particles, developing one of said images; modifying said background area to the same charge level as said discharged-area image to form another image; using toner particles, developing said another image; and developing the other of said images.
Claim 15
Independent Claim
84 words
A method of creating toner images on a charge retentive surface, said method including the steps of: uniformly charging said charge retentive surface; exposing said uniformly charged surface to form a tri-level latent image comprising a charged-area image, a discharged-area image and a background area; using toner particles, developing one of said images; modifying said background area to the same charge level as said discharged-area image to form another image; using toner particles, developing said another image; and developing the other of said images.
Claim 16
Dependent Claim
95 words
Apparatus for creating multiple color images, said apparatus comprising: a charge retentive surface; means for uniformly charging said charge retentive surface; exposure means for forming a tri-level image on said charge retentive surface, said tri-level image including at least one DAD image, at least one CAD image and background areas; means for developing one of said images; means for modifying at least one of said background areas to the same charge level as said discharged-area image for forming another image; means for developing said another image; and means for developing the other of said images.
Claim 17
Dependent Claim
95 words
Apparatus for creating multiple color images, said apparatus comprising: a charge retentive surface; means for uniformly charging said charge retentive surface; exposure means for forming a tri-level image on said charge retentive surface, said tri-level image including at least one DAD image, at least one CAD image and background areas; means for developing one of said images; means for modifying at least one of said background areas to the same charge level as said discharged-area image for forming another image; means for developing said another image; and means for developing the other of said images.
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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) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |