Patent US3909256A successfully refreshed from Google Patents.
US3909256A
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US
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Electrostatographic process for preparing screen printing member
Assignee: Xerox Corp
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Filing: 1973-12-26
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Granted: 1975-09-30
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Expires: 1993-12-26
Abstract
Abstract A novel method for preparing a stencil master is provided. The method comprises coating the voids of a suitable screen with a liquid but hardenable material which is impervious to a printing fluid and not dissolvable by said printing fluid and which has a viscosity and conductivity to permit removal by electrostatic attraction, contacting said screen in the absence of light with a member having an electrostatographic latent image, separating the screen and imaged member whereby the liquid is removed from the screen by electrostatic attraction in the charged areas of the image to provide voids in image configuration and hardening the liquid in the noncharged areas to form an imaged stencil master.
Inventors
- 👤 John B Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12; G03F5/00; G03F5/20; G03G; G03G13/00; G03G13/26; G03G13/32
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A METHOD FOR PREPARING A STENCIL COMPRISING PROVIDING A SUITABLE SCREEN, COATING THE VOIDS OF SAID SCREEN WITH A LIQUID MATERIAL HARDENABLE AT AMBIENT OR ELEVATED TEMPERATURE WHICH IS IMPERVIOUS TO A PRINTING FLUID AND NOT DISSOLVABLE BY SAID PRINTING FLUID AND WHICH HAS A VISCOSITY AND CONDUCTIVITY SUFFICIENT TO PERMIT REMOVAL BY ELECTROSTATIC ATTRACTION, SAID CONDUCTIVITY BEING LESS THAN 10**13 OHM/CM, CONTACTING SAID COATED SCREEN IN THE ABSENCE OF LIGHT WITH A MEMBER HAVING AN ELECTROSTATOGRAPHIC LATENT IMAGE SEPARATING THE MEMBERS WHEREBY LIQUID IS REMOVED FROM THE SCREEN BY ELECTROSTATIC ATTRACTION IN THE CHARGED AREAS OF THE IMAGE TO PROVIDE VOIDS IN IMAGE CONFIGURATION AND HARDENING THE LIQUID IN THE NONCHARGED AREAS TO FORM AN IMAGED STENCIL.
Claim 2
Independent Claim
118 words
A METHOD FOR PREPARING A STENCIL COMPRISING PROVIDING A SUITABLE SCREEN, COATING THE VOIDS OF SAID SCREEN WITH A LIQUID MATERIAL HARDENABLE AT AMBIENT OR ELEVATED TEMPERATURE WHICH IS IMPERVIOUS TO A PRINTING FLUID AND NOT DISSOLVABLE BY SAID PRINTING FLUID AND WHICH HAS A VISCOSITY AND CONDUCTIVITY SUFFICIENT TO PERMIT REMOVAL BY ELECTROSTATIC ATTRACTION, SAID CONDUCTIVITY BEING LESS THAN 10**13 OHM/CM, CONTACTING SAID COATED SCREEN IN THE ABSENCE OF LIGHT WITH A MEMBER HAVING AN ELECTROSTATOGRAPHIC LATENT IMAGE SEPARATING THE MEMBERS WHEREBY LIQUID IS REMOVED FROM THE SCREEN BY ELECTROSTATIC ATTRACTION IN THE CHARGED AREAS OF THE IMAGE TO PROVIDE VOIDS IN IMAGE CONFIGURATION AND HARDENING THE LIQUID IN THE NONCHARGED AREAS TO FORM AN IMAGED STENCIL.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the voids of the screen are coated with a silicone.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the image on the image member is xerographically formed by charging a photoconductive layer and exposing said layer to imagewise light to form an electrostatographic latent image.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the image member comprises zinc oxide photoreceptive paper.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the screen is a metal screen.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the screen is formed of stainless steel.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the screen has a mesh size of from 60 to 325 U.S. mesh.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the screen has a mesh size of from 100 to 250 U.S. mesh.
Claim 10
Independent Claim
142 words
A method of printing comprising providing a suitable screen, coating the voids of said screen with a liquid material hardenable at ambient or elevated temperature which is impervious to a printing fluid and not dissolvable by said printing fluid and which has a viscosity and conductivity sufficient to permit removal by electrostatic attraction, said conductivity being less than 1013 ohm/cm, contacting said coated screen in the absence of light with a member having an electrostatographic latent image, separating the members whereby the liquid is removed from the screen by electrostatic attraction in the charged areas of the image to provide voids in image configuration and hardening the liquid in the nonimaged areas to form an imaged stencil, contacting the resultant stencil with an image receiving member and passing ink through said voids to thereby form an inked image on said receiving member.
Claim 11
Independent Claim
142 words
A method of printing comprising providing a suitable screen, coating the voids of said screen with a liquid material hardenable at ambient or elevated temperature which is impervious to a printing fluid and not dissolvable by said printing fluid and which has a viscosity and conductivity sufficient to permit removal by electrostatic attraction, said conductivity being less than 1013 ohm/cm, contacting said coated screen in the absence of light with a member having an electrostatographic latent image, separating the members whereby the liquid is removed from the screen by electrostatic attraction in the charged areas of the image to provide voids in image configuration and hardening the liquid in the nonimaged areas to form an imaged stencil, contacting the resultant stencil with an image receiving member and passing ink through said voids to thereby form an inked image on said receiving member.
Claim 12
Dependent Claim
53 words
The method of claim 1 wherein the screen is coated with the liquid material, and doctored with a flexible blade to remove the liquid from the contact plane so that when the screen is contacted with and separated from the image member, the liquid is removed from the screen only by electrostatic attraction.
Claim 13
Dependent Claim
63 words
The method of claim 1 wherein the electrostatographic latent image member contains an image which is negative in sense and the screen is biased to a potential which is approximately the same as those areas of the image member which are of the higher potential so that when the members are contacted and separated, an image is provided which is positive in sense.
Claim 14
Dependent Claim
53 words
The method of claim 9 wherein the screen is coated with the liquid material, and doctored with a flexible blade to remove the liquid from the contact plane so that when the screen is contacted with and separated from the image member, the liquid is removed from the screen only by electrostatic attraction.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |