US3673598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the electrographic recording of charge images
Assignee: Agfa Gevaert AG
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Filing: 1970-06-22
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Granted: 1972-06-27
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Expires: 1990-06-22
Abstract
Abstract Imagewise differentiated electric charges are produced on a dielectric carrier material an apparatus for performing that production of imagewise differentiated electric charges comprising means for generating a constant corona discharge and means for controlling the amount of the corona discharge in order to obtain an imagewise differentiation.
Inventors
- 👤 Walter Simm
- 👤 Rudolf Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/323; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
An apparatus for the production of imagewise differentiated electric charge on a dielectric carrier material, comprising means for the production of a constant corona discharge and means for controlling the amount of the corona discharge reaching the carrier material which control means comprises an insulating plate pierced by a number of holes, the surface of the plate facing the corona discharge being coated with a continuous conductive coating, the other side being discontinuously coated with a conductive layer to provide a number of separate control elements which are eLectrically insulated from each other, each of the said elements being associated with and surrounding a hole, and also comprising means for the application of control voltages to the said elements.
Claim 2
Independent Claim
119 words
An apparatus for the production of imagewise differentiated electric charge on a dielectric carrier material, comprising means for the production of a constant corona discharge and means for controlling the amount of the corona discharge reaching the carrier material which control means comprises an insulating plate pierced by a number of holes, the surface of the plate facing the corona discharge being coated with a continuous conductive coating, the other side being discontinuously coated with a conductive layer to provide a number of separate control elements which are eLectrically insulated from each other, each of the said elements being associated with and surrounding a hole, and also comprising means for the application of control voltages to the said elements.
Claim 3
Dependent Claim
20 words
An apparatus as claimed in claim 1 in which the holes in the plate are arranged in a straight line.
Claim 4
Dependent Claim
18 words
An apparatus as claimed in claim 1 in which the control elements are a series of parallel strips.
Claim 5
Dependent Claim
22 words
An apparatus as claimed in claim 1 in which means are provided for moving the carrier material relative to the control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |