US3963342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curved screen
Assignee: Xerox Corp
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Filing: 1975-04-10
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Granted: 1976-06-15
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Expires: 1995-04-10
Abstract
Abstract An electrophotographic printing machine in which an arcuate screen member has a curvature substantially equal to the curvature of an arcuate photoconductive member employed therein. The centers of curvature of the screen member and photoconductive member are located in substantial coincidence with one another.
Inventors
- 👤 Howard M. Stark
- 👤 Robert N. Goren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/04; G03G15/04027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
An electrophotographic printing machine of the type having an arcuate photoconductive member, including: an arcuate screen member having a curvature substantially equal to the curvature of the photoconductive member, said screen member being mounted in the printing machine with the centers of curvature of the photoconductive member and said screen member being in substantial coincidence with one another.
Claim 2
Dependent Claim
58 words
An electrophotographic printing machine of the type having an arcuate photoconductive member, including: an arcuate screen member having a curvature substantially equal to the curvature of the photoconductive member, said screen member being mounted in the printing machine with the centers of curvature of the photoconductive member and said screen member being in substantial coincidence with one another.
Claim 3
Dependent Claim
31 words
A printing machine as recited in claim 1, wherein said screen member has a radius of curvature greater than the radius of curvature of the photoconductive member defining a space therebetween.
Claim 4
Dependent Claim
58 words
A printing machine as recited in claim 2, further including: means for charging the photoconductive member to a substantially uniform level; and means for projecting a light image of an original document being reproduced in the printing machine through said screen member irradiating the charged photoconductive member to record a modulated electrostatic latent image on the photoconductive member.
Claim 5
Dependent Claim
35 words
A printing machine as recited in claim 3, further including means for filtering the light image projected through said screen member onto the charged photoconductive member recording a modulated single color electrostatic latent image thereon.
Claim 6
Dependent Claim
73 words
A printing machine as recited in claim 4, further including: means for developing the single color electrostatic latent image recorded on the photoconductive member with toner particles complementary in color to the color of the filtered light image transmitted through said screen member; means for transferring the toner particles from the photoconductive member to a sheet of support material; and means for permanently affixing the toner particles to the sheet of support material.
Claim 7
Dependent Claim
17 words
A printing machine as recited in claim 5, wherein said screen member includes a transparent sheet member.
Claim 8
Dependent Claim
20 words
A printing machine as recited in claim 6, wherein said sheet member includes a plurality of spaced opaque lines thereon.
Claim 9
Dependent Claim
34 words
A printing machine as recited in claim 7, wherein said projecting means includes a lens spaced from the surface of the photoconductive member and adapted to form a light image of the original document.
Claim 10
Dependent Claim
51 words
A printing machine as recited in claim 8, wherein the spaced opaque lines located on said sheet member lie at the intersection of a first plane passing through said sheet member and a point located on a line normal to the longitudinal axis of the photoconductive member at said screen member.
Claim 11
Dependent Claim
33 words
A printing machine as recited in claim 9, wherein said projecting means includes a sheet of opaque material having a slit therein, said sheet being interposed between said lens and said screen member.
References Cited (Backward Citations)
US3120790A
Cited
US3517596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |