US3994723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotograhic process involving steps of subsequent discharge of areas receiving insufficient exposure
Assignee: Xerox Corp
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Filing: 1975-03-17
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Granted: 1976-11-30
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Expires: 1995-03-17
Abstract
Abstract A process for producing an electrostatographic image wherein a uniformly charged photoconductive plate is exposed to a pattern of light and shadow to produce an electrostatic latent image, the continuous zones of the photoconductive plate which do not receive sufficient light during the exposure to discharge the plate are subsequently discharged and thereafter the charged areas of the plate are developed to provide a developed electrostatograpic image.
Inventors
- 👤 Edric Raymond Brooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/045; G03G15/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
An electrostatographic process including the steps of: a. applying a uniform electrostatic charge to a photoconductive plate, b. exposing the charged plate to a pattern of light and shadow to discharge selected areas of the plate and produce an electrostatic latent image on the plate, c. detecting continuous zones of the plate which do not receive sufficient light during exposure step (b) to discharge the plate, d. discharging the plate in said zones, and e. developing charged areas of the plate.
Claim 2
Dependent Claim
81 words
An electrostatographic process including the steps of: a. applying a uniform electrostatic charge to a photoconductive plate, b. exposing the charged plate to a pattern of light and shadow to discharge selected areas of the plate and produce an electrostatic latent image on the plate, c. detecting continuous zones of the plate which do not receive sufficient light during exposure step (b) to discharge the plate, d. discharging the plate in said zones, and e. developing charged areas of the plate.
Claim 3
Dependent Claim
58 words
An electrostatographic process including the steps of: a. applying a uniform electrostatic charge to an electrostatographic plate, b. discharging selected portions of the electrostatographic plate to produce an electrostatic latent image on the plate, c. detecting continuous zones on the plate which are not discharged during step (b), and d. discharging the plate in the detected continuous zones.
Claim 4
Dependent Claim
58 words
An electrostatographic process including the steps of: a. applying a uniform electrostatic charge to an electrostatographic plate, b. discharging selected portions of the electrostatographic plate to produce an electrostatic latent image on the plate, c. detecting continuous zones on the plate which are not discharged during step (b), and d. discharging the plate in the detected continuous zones.
Claim 5
Dependent Claim
27 words
An electrostatographic process according to claim 2 further including the step of developing the charged areas of the plate after the continuous zones thereon have been discharged.
Claim 6
Dependent Claim
61 words
An electrostatographic process according to claim 1 wherein said electrostatographic plate includes a photoconductive layer, the discharge of selected portions of the charged plate being accomplished by the step of exposing the charged photoconductive layer to a pattern of light and shadow to discharge the layer in areas exposed to the light to produce an electrostatic latent image on the plate.
References Cited (Backward Citations)
US3788739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |