Patent US3867674A successfully refreshed from Google Patents.
US3867674A
Expired / Lapsed
US
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Process for the electrographic recording of charge images
Assignee: Agfa Gevaert AG
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Filing: 1973-06-26
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Granted: 1975-02-18
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Expires: 1993-06-26
Abstract
Abstract In a process for the production of electrostatic images on insulating recording material the recording material is moved over a contact electrode and over the point of contact with this electrode, the charge image is recorded by a suitable arrangement of character writing electrodes, while the contact electrode is wetted with a conductive liquid at the point of contact with the recording material.
Inventors
- 👤 Walter Simm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/323
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
160 words
A proces for the production of electric charge distribution on a smooth insulating web having a sPecific resistance of from about 1012 to 1019 Ohm cm. which moves relative to an electrode assembly comprising a first electrode which can apply varying electric charges to one surface of the web and a second electrode which contacts the other surface of the web at least at a position adjacent to the area in which the first electrode can apply charges characterized by the steps of providing a contact edge on the second electrode, traversing the insulating web in firm contact over the edge, providing a source of a conductive liquid having an electrical conductivity greater than about 10 9 Ohm 1cm 1 adjacent the edge, and contacting the web with a source of liquid and the edge to dispose the conductive liquid inbetween the web and the contacted edge whereby intimate electrical contact is obtained between the web and the second electrode.
Claim 2
Dependent Claim
160 words
A proces for the production of electric charge distribution on a smooth insulating web having a sPecific resistance of from about 1012 to 1019 Ohm cm. which moves relative to an electrode assembly comprising a first electrode which can apply varying electric charges to one surface of the web and a second electrode which contacts the other surface of the web at least at a position adjacent to the area in which the first electrode can apply charges characterized by the steps of providing a contact edge on the second electrode, traversing the insulating web in firm contact over the edge, providing a source of a conductive liquid having an electrical conductivity greater than about 10 9 Ohm 1cm 1 adjacent the edge, and contacting the web with a source of liquid and the edge to dispose the conductive liquid inbetween the web and the contacted edge whereby intimate electrical contact is obtained between the web and the second electrode.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1 in which the first electrode can apply varying charges along a line transverse to the direction of motion of the web.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 2 in which the second electrode comprises a substantial straight edge over which the web is drawn.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 3 in which part of the liquid is contained inside the second electrode and is conducted to the edge by a channel, or channels.
Claim 6
Dependent Claim
34 words
A process as claimed in claim 4 in which the channel or channels contain a wick or wicks which contact the web at the point of contact of the web with the second electrode.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 3 in which the other surface of the web is moistened before it reaches the point of contact with the second electrode.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 6 in which the web is moistened with a wick or pad which is kept moist with the conductive liquid.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 1 in which the conductive liquid used is water.
Claim 10
Dependent Claim
19 words
A process as claimed in claim 1 in which the web is a web of polycarbonate or polyterephthalate plastics.
Claim 11
Dependent Claim
19 words
A process as claimed in claim 1 in which the web is 10 to 60 Mu m thick. .
Claim 12
Dependent Claim
15 words
A process as set forth in claim 1 wherein the web is a plastic foil.
Claim 13
Dependent Claim
16 words
A process as set forth in claim 11 wherein the first electrode applies a corona discharge.
Claim 14
Dependent Claim
26 words
A process as set forth in claim 11 wherein the contact with the source of conductive liquid is made immediately before the web contacts the edge.
Claim 15
Dependent Claim
23 words
A process as set forth in claim 11 wherein the contact with the source of conductive liquid is made immediately at the edge.
Claim 16
Dependent Claim
58 words
A contact electrode for helping produce an electric charge distribution on an insulating web which moves in contact relative to the electrode comprising a body, a relatively thin edge on the body contacting the web, and a channel within the thin edge for supplying a conductive liquid to the area of the web contacted by the thin edge.
Claim 17
Dependent Claim
58 words
A contact electrode for helping produce an electric charge distribution on an insulating web which moves in contact relative to the electrode comprising a body, a relatively thin edge on the body contacting the web, and a channel within the thin edge for supplying a conductive liquid to the area of the web contacted by the thin edge.
Claim 18
Dependent Claim
23 words
An electrode as claimed in claim 15, wherein a conduit is provided within the electrode for supplying the conductive liquid to the channel.
Claim 19
Dependent Claim
24 words
An electrode as claimed in claim 15, wherein a wick connects the channel with the conduit and extends to the edge of the channel.
Claim 20
Dependent Claim
44 words
An electrode as claimed in claim 15, wherein an absorbent pad soaked with the conductive liquid is provided on a side of the electrode in a position wherein it is contacted by the web before the web passes over the edge of the electrode.
Claim 21
Dependent Claim
68 words
An electrode as claimed in claim 15, wherein a discharge electrode is spaced from the contact electrode for providing charges to the side of the web remote from the contact electrode, an apertured diaphragm is disposed between the discharge electrode and the contact electrode and adjacent the contact electrode, and electrical potential means connected to the apertured diaphragm for controlling the charging of the surface of the web.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |