Patent US4291903A successfully refreshed from Google Patents.
Patent US3592541A successfully refreshed from Google Patents.
US3592541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying system using electrogasdynamics
Assignee: Energy Innovations Inc
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Filing: 1968-09-30
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Granted: 1971-07-13
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Expires: 1988-09-30
Abstract
Abstract An apparatus and method for reproducing an image on a dielectric sheet, such as paper or the like, comprising the use of an electrogasdynamic generator as a spray gun for producing a space charge cloud of ionized ink in the vicinity of one side of the dielectric sheet whose other side has been provided with an electrostatic charge image produced through the use of a conventional xerographic plate and process, whereby an improved quality ink image is produced on the sheet by virtue of the tendency of electrogasdynamically produced particles to achieve a uniform charge distribution on the dielectric surface. Undesirable fringing effects are avoided and the process is speeded up over the conventional xerographic process by reducing the number of mechanical operations required, such as, eliminating the need for cleaning toner from the xerographic plate. The method may be adapted to produce either negative or positive images and for use with high-speed printing systems.
Inventors
- 👤 Meredith C Gourdine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A method of image reproduction comprising the steps of: a. disposing a layer of electrostatic charge between and in contact with a surface of a photoconductive plate and one surface of a dielectric sheet; b. exposing the plate to light in the pattern of an image to be reproduced thereby discharging portions of the charge layer in the pattern of the image; and c. directing an electrogasdynamically produced cloud of ionized ink against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 2
Independent Claim
89 words
A method of image reproduction comprising the steps of: a. disposing a layer of electrostatic charge between and in contact with a surface of a photoconductive plate and one surface of a dielectric sheet; b. exposing the plate to light in the pattern of an image to be reproduced thereby discharging portions of the charge layer in the pattern of the image; and c. directing an electrogasdynamically produced cloud of ionized ink against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 3
Independent Claim
99 words
A method of image reproduction comprising the steps of: a. depositing a layer of electrostatic charge on one surface of a dielectric sheet on which sheet an image is to be reproduced; b. placing the charged surface against the surface of a photoconductive plate; c. exposing the plate to light in the pattern of an image to be reproduced thereby discharging portions of the charged layer in the pattern of the image; and d. directing an electrogasdynamically produced cloud of ionized ink against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 4
Independent Claim
99 words
A method of image reproduction comprising the steps of: a. depositing a layer of electrostatic charge on one surface of a dielectric sheet on which sheet an image is to be reproduced; b. placing the charged surface against the surface of a photoconductive plate; c. exposing the plate to light in the pattern of an image to be reproduced thereby discharging portions of the charged layer in the pattern of the image; and d. directing an electrogasdynamically produced cloud of ionized ink against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 2 wherein before the developing step a layer of electrostatic charge is deposited on the opposite surface of said dielectric sheet and the originally charged surface is discharged.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 2 including fixing the developed image by coating with a polymer.
Claim 7
Independent Claim
99 words
An apparatus for reproducing an image comprising: a. a plate of insulating photoconductive material; b. means for depositing a layer of electrostatic charge on a surface of said plate in contact with one surface of a dielectric sheet; c. means for exposing said plate to light in the pattern of an image to be reproduced thereby discharging portions of the charge layer in the pattern of the image; and d. means for electrogasdynamically producing a cloud of ionized ink to be directed against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 8
Independent Claim
99 words
An apparatus for reproducing an image comprising: a. a plate of insulating photoconductive material; b. means for depositing a layer of electrostatic charge on a surface of said plate in contact with one surface of a dielectric sheet; c. means for exposing said plate to light in the pattern of an image to be reproduced thereby discharging portions of the charge layer in the pattern of the image; and d. means for electrogasdynamically producing a cloud of ionized ink to be directed against the opposite surface of the dielectric sheet to develop the charge layer pattern of the image.
Claim 9
Dependent Claim
46 words
Apparatus as claimed in claim 5 comprising means for depositing a layer of electrostatic charge on the opposite surface of said dielectric sheet and means for discharging said charge layer on the other surface of said sheet prior to the directing of said ionized ink cloud.
Claim 10
Dependent Claim
118 words
A high-speed printing apparatus comprising: a. a rotating cylinder having a photoconductive outer surface; b. a light source disposed at the center of said cylinder; c. means on the inner surface of said cylinder having light-conducting portions defining an image pattern; d. means adjacent the outer surface of said cylinder for electrogasdynamically producing an ionized ink cloud in the vicinity of the cylinder outer surface, which means is spaced from said outer surfacE to accommodate the passage of a dielectric sheet riding on said surface; and e. means for depositing a layer of electrostatic charge on the inside surface of said dielectric sheet prior to the contact of said inside surface with the outer surface of said cylinder.
Claim 11
Dependent Claim
118 words
A high-speed printing apparatus comprising: a. a rotating cylinder having a photoconductive outer surface; b. a light source disposed at the center of said cylinder; c. means on the inner surface of said cylinder having light-conducting portions defining an image pattern; d. means adjacent the outer surface of said cylinder for electrogasdynamically producing an ionized ink cloud in the vicinity of the cylinder outer surface, which means is spaced from said outer surfacE to accommodate the passage of a dielectric sheet riding on said surface; and e. means for depositing a layer of electrostatic charge on the inside surface of said dielectric sheet prior to the contact of said inside surface with the outer surface of said cylinder.
Claim 12
Dependent Claim
32 words
An apparatus as claimed in claim 7 comprising means for depositing a polymer coating on the outside surface of said dielectric sheet after said outside surface has passed said ionized ink cloud.
Claim 13
Dependent Claim
101 words
A high-speed printing apparatus comprising: a. means for sequentially producing intelligence in the form of electromagnetic energy patterns; b. means receiving said patterns and having a surface for sequentially reproducing the patterns in the form of conductive areas; c. means for passing one surface of a dielectric sheet over said reproducing surface; d. means for depositing a layer of electrostatic charge on said surface of the sheet prior to its passing over said reproducing surface; and e. means for electrogasdynamically producing and directing an ionized ink cloud against the opposite surface of said sheet upon its passing over said reproducing surface.
Claim 14
Dependent Claim
101 words
A high-speed printing apparatus comprising: a. means for sequentially producing intelligence in the form of electromagnetic energy patterns; b. means receiving said patterns and having a surface for sequentially reproducing the patterns in the form of conductive areas; c. means for passing one surface of a dielectric sheet over said reproducing surface; d. means for depositing a layer of electrostatic charge on said surface of the sheet prior to its passing over said reproducing surface; and e. means for electrogasdynamically producing and directing an ionized ink cloud against the opposite surface of said sheet upon its passing over said reproducing surface.
Claim 15
Dependent Claim
80 words
A high-speed printing apparatus comprising: a. means having a surface for sequentially producing patterns of electrically conductive areas thereon; b. means for passing a dielectric sheet over said conductive surface; c. means for depositing a layer of electrostatic charge on the surface of said sheet which contacts said conductive surface prior to the contacting; and d. means for electrogasdynamically producing and directing an ionized ink cloud against a surface of said sheet after it has passed over said reproducing surface.
Claim 16
Dependent Claim
80 words
A high-speed printing apparatus comprising: a. means having a surface for sequentially producing patterns of electrically conductive areas thereon; b. means for passing a dielectric sheet over said conductive surface; c. means for depositing a layer of electrostatic charge on the surface of said sheet which contacts said conductive surface prior to the contacting; and d. means for electrogasdynamically producing and directing an ionized ink cloud against a surface of said sheet after it has passed over said reproducing surface.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |