Patent US3884684A successfully refreshed from Google Patents.
US3884684A
Expired / Lapsed
US
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Electrostatic developing process employing a porous photoconductive member
Assignee: Ohno Res & Dev Lab
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Filing: 1973-04-23
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Granted: 1975-05-20
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Expires: 1993-04-23
Abstract
Abstract A method for electrostatically printing, employing a photosensitive plate comprising a conductive substrate having fine pores distributed uniformly over the surface thereof and a liquid-repellent photoconductive layer coating the surface of the substrate except the part of the pores. An electrostatic latent image is formed on the photoconductive layer, and a liquid developer is supplied from the back side of the photosensitive plate. Next, a voltage is applied between the plate and an opposing electrode contacting a paper to be printed, disposed in an opposing relation to the plate so that the latent image is developed and transferred to the paper.
Inventors
- 👤 Genji Ohno
- 👤 Eiichi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/06; G03G15/10; G03G15/101; G03G15/102; G03G5/00; G03G5/10; G03G9/00; G03G9/16; G03G9/18; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
A METHOD FOR ELECTROSTATIC DEVELOPING WHICH COMPRISES THE STEPS OF: FORMING A LATENT ELECTROSTATIC IMAGE ON A COMPOSITE TRANSFER MEMBER COMPRISING AN ELECTRICALLY CONDUCTIVE SUBSTRATE HAVING A SURFACE COATED WITH A THIN PHOTOCONDUCTIVE LAYER, SAID TRANSFER MEMBER HAVING UNIFORMLY DISTRIBUTED FINE PORES DISPOSED THERETHROUGH, AND SAID PHOTOCONDUCTIVE LAYER BEING REPELLENT TO AQUEOUS LIQUID, APPLYING TO SAID COMPOSITE TRANSFER MEMBER OPPOSITE SAID PROTOCONDUCTIVE LAYER A DEVELOPER LIQUID COMPRISING TONER IN AN AQUEOUS CARRIER TO PROVIDE DEVELOPER LIQUID IN THE PORES OF SAID SUBSTRATE ADJACENT SAID PHOTOCONDUCTIVE LAYER, SAID AQUEOUS DEVELOPER LIQUID ESTABLISHING A CONTACT ANGLE WITH SAID PHOTOCONDUCTIVE LAYER IN SAID PORES OF GREATER THAN 90*, ADVANCING AN ABSORBENT PRINTING MEMBER IN CONTACT WITH THE PHOTOCONDUCTIVE MEMBER BEARING THE LATENT ELECTROSTATIC IMAGE, APPLING A D.C. VOLTAGE BETWEEN THE ELECTRICALLY CONDUCTIVE SUBSTRATE OF THE COMPOSITE TRANSFER MEMBER AND ELECTRODE MEANS ADJACENT THE PRINTING MEMBER ON OPPOSITE SIDE FROM SAID TRANSFER MEMBER TO DECREASE THE CONTACT ANGLE OF SAID AQUEOUS LIQUID DEVELOPER IN SAID PORES TO LESS THAN 90*, FLOWING AQUEOUS LIQUID DEVELOPER THROUGH SAID PORES ONTO SAID PRINTING MEMBER IN SELECTED AREAS CORRESPONDING TO THE LATENT ELECTROSTATIC IMAGE, AND SEPARATING SAID PRINTING MEMBER FROM SAID TRANSFER MEMBER
Claim 2
Independent Claim
195 words
A METHOD FOR ELECTROSTATIC DEVELOPING WHICH COMPRISES THE STEPS OF: FORMING A LATENT ELECTROSTATIC IMAGE ON A COMPOSITE TRANSFER MEMBER COMPRISING AN ELECTRICALLY CONDUCTIVE SUBSTRATE HAVING A SURFACE COATED WITH A THIN PHOTOCONDUCTIVE LAYER, SAID TRANSFER MEMBER HAVING UNIFORMLY DISTRIBUTED FINE PORES DISPOSED THERETHROUGH, AND SAID PHOTOCONDUCTIVE LAYER BEING REPELLENT TO AQUEOUS LIQUID, APPLYING TO SAID COMPOSITE TRANSFER MEMBER OPPOSITE SAID PROTOCONDUCTIVE LAYER A DEVELOPER LIQUID COMPRISING TONER IN AN AQUEOUS CARRIER TO PROVIDE DEVELOPER LIQUID IN THE PORES OF SAID SUBSTRATE ADJACENT SAID PHOTOCONDUCTIVE LAYER, SAID AQUEOUS DEVELOPER LIQUID ESTABLISHING A CONTACT ANGLE WITH SAID PHOTOCONDUCTIVE LAYER IN SAID PORES OF GREATER THAN 90*, ADVANCING AN ABSORBENT PRINTING MEMBER IN CONTACT WITH THE PHOTOCONDUCTIVE MEMBER BEARING THE LATENT ELECTROSTATIC IMAGE, APPLING A D.C. VOLTAGE BETWEEN THE ELECTRICALLY CONDUCTIVE SUBSTRATE OF THE COMPOSITE TRANSFER MEMBER AND ELECTRODE MEANS ADJACENT THE PRINTING MEMBER ON OPPOSITE SIDE FROM SAID TRANSFER MEMBER TO DECREASE THE CONTACT ANGLE OF SAID AQUEOUS LIQUID DEVELOPER IN SAID PORES TO LESS THAN 90*, FLOWING AQUEOUS LIQUID DEVELOPER THROUGH SAID PORES ONTO SAID PRINTING MEMBER IN SELECTED AREAS CORRESPONDING TO THE LATENT ELECTROSTATIC IMAGE, AND SEPARATING SAID PRINTING MEMBER FROM SAID TRANSFER MEMBER
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein the photoconductive layer consists essentially of an inorganic photosemiconductor and a water-repellent organic resin.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein said transfer member comprises a cylindrical member comprising said substrate and said photoconductive layer.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein said transfer member comprises a continuous, flexible belt comprising said substrate and said photoconductive layer.
Claim 6
Dependent Claim
18 words
The method of claim 1, wherein said photoconductive layer comprises a liquid-repellent resin binder and a photoconductive material.
Claim 7
Dependent Claim
26 words
The method of claim 1, wherein said photoconductive layer comprises a first layer having a liquid repellent property and a second layer having a photoconductive property.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein said photoconductive layer has a thickness in the range of about 3 Mu to 400 Mu .
Claim 9
Dependent Claim
22 words
The method of claim 7, wherein said pores have a diameter in the range of about 10 Mu to 100 Mu .
Claim 10
Dependent Claim
28 words
The method of claim 1, wherein said pores are uniformly spaced from each other by a distance in the range of about 10 Mu to 100 Mu .
Claim 11
Dependent Claim
27 words
The method of claim 1, wherein the voltage applied to the substrate is of the same polarity as that of the electrostatic charges of the latent image.
Claim 12
Dependent Claim
27 words
The method of claim 1, wherein the voltage applied to the substrate is of an opposite polarity to that of the electrostatic charges of the latent image.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |