Patent US5030531A successfully refreshed from Google Patents.
US5030531A
Expired / Lapsed
US
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Tri-level xerographic two-color forms printer with slide attachment
Assignee: Xerox Corp
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Filing: 1990-04-04
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Granted: 1991-07-09
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Expires: 2010-04-04
Abstract
Abstract Highlight color imaging apparatus wherein tri-level images are created by using a transparency with optical densities suitable for forming a bi-level image having relatively high and intermediate voltage levels. A modulated light source is then employed to form a third voltage level on the imaging surface by reducing the intermediate voltage level to a relatively low residual voltage level.
Inventors
- 👤 Nancy B. Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:18
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1295; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/011; G06K15/129
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A method of forming tri-level latent electrostatic images comprising CAD and DAD image areas and a background area intermediate said CAD and DAD image areas, said method including the steps of: uniformly charging a charge retentive surface; projecting light through a transparency in order to form one of said image areas; and using a raster output scanner, forming the other of said image areas.
Claim 2
Independent Claim
64 words
A method of forming tri-level latent electrostatic images comprising CAD and DAD image areas and a background area intermediate said CAD and DAD image areas, said method including the steps of: uniformly charging a charge retentive surface; projecting light through a transparency in order to form one of said image areas; and using a raster output scanner, forming the other of said image areas.
Claim 3
Dependent Claim
27 words
The method according to claim 1 wherein the step of forming one of said images comprises forming said CAD image area and simultaneously forming said background area.
Claim 4
Dependent Claim
26 words
The method according to claim 2 wherein the step of forming said other image area comprises forming said DAD image area out of said background area.
References Cited (Backward Citations)
US4078929A
Cited
US4167324A
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US4385822A
Cited
NL8202297A
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US4774546A
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US4920024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |