US4491408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic system development modulation
Assignee: Xerox Corp
•
Filing: 1984-01-03
•
Granted: 1985-01-01
•
Expires: 2004-01-03
Abstract
Abstract An electrostatographic imaging system comprising an insulating layer having an imaging surface, a conductive substrate for the insulating layer, means to form an electrostatic latent image on the imaging surface, means to form a toner image on the imaging surface in conformance to the electrostatic latent image and means to supply a variable direct current voltage to the conductive substrate. The electrostatographic imaging system may include an electrically conductive member parallel to and spaced from the imaging surface and a means to supply a variable electrical bias to the electrically conductive member in response to a change in the value of direct current voltage supplied to the conductive substrate.
Inventors
- 👤 Edward C. Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/065; G03G15/04; G03G15/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
An electrostatographic imaging system comprising an imaging member comprising an electrically conductive substrate and at least one electrostatographic insulating layer having an imaging surface, means to form an electrostatic latent image on said imaging surface, means to form a toner image on said imaging surface in conformance to said electrostatic latent image, and means to supply a variable direct current voltage to said electrically conductive substrate.
Claim 2
Dependent Claim
66 words
An electrostatographic imaging system comprising an imaging member comprising an electrically conductive substrate and at least one electrostatographic insulating layer having an imaging surface, means to form an electrostatic latent image on said imaging surface, means to form a toner image on said imaging surface in conformance to said electrostatic latent image, and means to supply a variable direct current voltage to said electrically conductive substrate.
Claim 3
Dependent Claim
34 words
An electrostatographic imaging system in accordance to claim 1 wherein said means to form a toner image on said imaging surface includes an electrically conductive member parallel to and spaced from said imaging surface.
Claim 4
Dependent Claim
38 words
An electrostatographic imaging system in accordance to claim 2 including means to supply a variable electrical bias to said electrically conductive member in response to a change of said direct current voltage supplied to said electrically conductive substrate.
Claim 5
Dependent Claim
48 words
An electrostatographic imaging system in accordance to claim 3 wherein said means to supply a variable electrical bias to said electrically conductive member comprises a resistance bridge electrically linking said electrically conductive member with said means to supply a variable direct current voltage to said electrically conductive substrate.
Claim 6
Dependent Claim
52 words
An electrostatographic imaging system in accordance to claim 3 wherein said means to supply a variable electrical bias to said electrically conductive member in response to a change of direct current voltage supplied to said electrically conductive substrate includes a potentiometer for controlling said variable electrical bias to said electrically conductive member.
Claim 7
Dependent Claim
29 words
An electrostatographic imaging system in accordance to claim 1 wherein said means to supply said variable direct current voltage to said electrically conductive substrate comprises a programmable voltage supply.
Claim 8
Dependent Claim
39 words
An electrostatographic imaging system in accordance to claim 1 wherein said means to supply a variable direct current voltage to said electrically conductive substrate includes a potentiometer for controlling said variable direct current voltage to said electrically conductive substrate.
Claim 9
Dependent Claim
19 words
An electrostatographic imaging system in accordance to claim 1 wherein said electrostatographic insulating layer is a photoconductive insulating layer.
Claim 10
Dependent Claim
45 words
An electrostatographic imaging system in accordance to claim 9 wherein said means to form an electrostatic latent image on said imaging surface comprises means to uniformly charge said photoconductive insulating layer and means to expose said photoconductive insulating layer to activating radiation in image configuration.
Claim 11
Dependent Claim
19 words
An electrostatographic imaging system in accordance to claim 1 including a variable contrast control and a variable brightness control.
References Cited (Backward Citations)
US3782818A
Cited
US4052127A
Cited
US4087171A
Cited
US4128329A
Cited
US4034709A
Cited
US4306804A
Cited
US4200391A
Cited
US4149487A
Cited
US4256401A
Cited
US4375328A
Cited
US4310237A
Cited
US4343548A
Cited
US4318607A
Cited
US4377338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |