US3724941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic apparatus
Assignee: Xerox Corp
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Filing: 1971-09-16
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Granted: 1973-04-03
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Expires: 1991-09-16
Abstract
Abstract Electrophotographic reproduction systems in which the contrast may be suitably varied in accordance with the particular type of original image which is to be reproduced by varying the amount or degree of electrostatic charge applied to a photoreceptive surface during uniform charging thereof.
Inventors
- 👤 S Honjo
- 👤 S Matsumoto
- 👤 M Takimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:13
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/043; G03G15/02; G03G15/0266
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
An electrophotographic apparatus comprising in combination, a photoconductive member adapted to receive a uniform electrostatic charge, means for uniformly electrostatically charging said photoconductive member, means for projecting an image of a light transmitting original onto the surface of sAid photoconductive member, means for projecting an image of a light reflective original onto the surface of said photoconductive member, and means for varying the amount of electrostatic charge applied to said photoconductive member in response to the selective activation of said image projecting means.
Claim 2
Dependent Claim
83 words
An electrophotographic apparatus comprising in combination, a photoconductive member adapted to receive a uniform electrostatic charge, means for uniformly electrostatically charging said photoconductive member, means for projecting an image of a light transmitting original onto the surface of sAid photoconductive member, means for projecting an image of a light reflective original onto the surface of said photoconductive member, and means for varying the amount of electrostatic charge applied to said photoconductive member in response to the selective activation of said image projecting means.
Claim 3
Dependent Claim
102 words
In an electrophotographic apparatus, a photoconductive member adapted to receive a uniform electrostatic charge, means for uniformly electrostatically charging said photoconductive member, means for projecting an image of a light transmitting original to be reproduced onto the surface of said photoconductive member, means for projecting an image of a light reflective original to be reproduced onto the surface of said photoconductive member, means selectively rendering one of said image projecting means operable, and means responsive to said selective rendering means for varying the amount of electrostatic charge applied to said photoconductive member by said means for uniformly electrostatically charging said photoconductive member.
Claim 4
Dependent Claim
102 words
In an electrophotographic apparatus, a photoconductive member adapted to receive a uniform electrostatic charge, means for uniformly electrostatically charging said photoconductive member, means for projecting an image of a light transmitting original to be reproduced onto the surface of said photoconductive member, means for projecting an image of a light reflective original to be reproduced onto the surface of said photoconductive member, means selectively rendering one of said image projecting means operable, and means responsive to said selective rendering means for varying the amount of electrostatic charge applied to said photoconductive member by said means for uniformly electrostatically charging said photoconductive member.
Claim 5
Dependent Claim
37 words
Structure according to claim 2 wherein said means for varying the amount of electrostatic charge applied to said photoconductive member comprises means for varying the voltage supplied to said means for uniformly electrostatically charging said photoconductive member.
Claim 6
Dependent Claim
37 words
Structure according to claim 2 wherein said means for varying the amount of electrostatic charge applied to said photoconductive member comprises means positionable intermediate said photoconductive member and said means for uniformly electrostatically charging said photoconductive member.
References Cited (Backward Citations)
US1485147A
Cited
US2965483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |