US3862848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer of color images
Assignee: Research Laboratories of Australia Pty Ltd
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Filing: 1972-12-20
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Granted: 1975-01-28
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Expires: 1992-12-20
Abstract
Abstract An electrostatic method for the reproduction of printed matter in which an electrostatic latent image is developed by the attraction of electroscopic marking particles thereto and is then transferred to a first receptor surface by the simultaneous application of contact and a directional electrostatic field of a polarity to urge the marking particles to receptor surface, the image being then transferred from the first receptor surface to a second receptor surface by the simultaneous application of contact and a directional electrostatic field of opposite polarity to urge the marking particles to the second receptor surface.
Inventors
- 👤 Brian George Marley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:04
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01; G03G13/14; G03G13/16; G03G15/00; G03G15/04; G03G15/04027; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
AN ELECTROSTATIC METHOD FOR THE REPRODUCTION OF COLOR PRINTED MATTER COMPRISING THE FOLLOWING STEPS: A. PRODUCING AN ELECTROSTATIC LATENT IMAGE ON THE DIELECTRIC SURFACE OF AN ELECROSTATICALLY CHARGEABLE RECORDING MEMBER; B. CONTACTING SAID ELECTROSTATIC LATENT IMAGE WITH ELECTROSCOPIC MARKING PARTICLES OF A COLOR SUSPENDED IN AN INSULATING CARRIER LIQUID TO DEVELOP SAID LATENT IMAGE; C. TRANSFERRING SAID DEVELOPED IMAGE TO AN ELECTRICALLY CONDUCTING FIRST RECEPTOR SURFACES BY THE SIMULTANEOUS APPLICATION OF CONTACT AND A DIRECTIONAL ELECTROSTATIC FIELD OF A POLARITY TO URGE THE MARKING PARTICLES TO SAID FIRST RECEPTOR SURFACE; D. TRANSFERRING SAID DEVELOPED IMAGE FROM SAID FIRST RECEPTOR SURFACE TO A SECOND RECEPTOR SURFACE BY THE SIMULTANEOUS APPLICATION OF CONTACT AND A DIRECTIONAL ELECTROSTATIC FIELD OF A POLARITY TO URGE DEVELOPED IMAGE TO SAID SECOND FIXING SAID DEVELOPED IMAGE TO SAID SECOND RECPTOR SURE. FIXING SAID DEVELOPED IMAGE TO SAID SECOND RECEPTOR SURFACE; AND, REPEATING STEPS (A) TO (E) AT LEAST ONCE USING ELECTROSCOPIC MARKING PARTICLES OF A DIFFERENT COLOR TO PRODUCE A PRINT ON SAID SECOND RECEPTOR SURFACE CONTAINING AT LEAST TWO COLORS.
Claim 2
Dependent Claim
175 words
AN ELECTROSTATIC METHOD FOR THE REPRODUCTION OF COLOR PRINTED MATTER COMPRISING THE FOLLOWING STEPS: A. PRODUCING AN ELECTROSTATIC LATENT IMAGE ON THE DIELECTRIC SURFACE OF AN ELECROSTATICALLY CHARGEABLE RECORDING MEMBER; B. CONTACTING SAID ELECTROSTATIC LATENT IMAGE WITH ELECTROSCOPIC MARKING PARTICLES OF A COLOR SUSPENDED IN AN INSULATING CARRIER LIQUID TO DEVELOP SAID LATENT IMAGE; C. TRANSFERRING SAID DEVELOPED IMAGE TO AN ELECTRICALLY CONDUCTING FIRST RECEPTOR SURFACES BY THE SIMULTANEOUS APPLICATION OF CONTACT AND A DIRECTIONAL ELECTROSTATIC FIELD OF A POLARITY TO URGE THE MARKING PARTICLES TO SAID FIRST RECEPTOR SURFACE; D. TRANSFERRING SAID DEVELOPED IMAGE FROM SAID FIRST RECEPTOR SURFACE TO A SECOND RECEPTOR SURFACE BY THE SIMULTANEOUS APPLICATION OF CONTACT AND A DIRECTIONAL ELECTROSTATIC FIELD OF A POLARITY TO URGE DEVELOPED IMAGE TO SAID SECOND FIXING SAID DEVELOPED IMAGE TO SAID SECOND RECPTOR SURE. FIXING SAID DEVELOPED IMAGE TO SAID SECOND RECEPTOR SURFACE; AND, REPEATING STEPS (A) TO (E) AT LEAST ONCE USING ELECTROSCOPIC MARKING PARTICLES OF A DIFFERENT COLOR TO PRODUCE A PRINT ON SAID SECOND RECEPTOR SURFACE CONTAINING AT LEAST TWO COLORS.
Claim 3
Dependent Claim
113 words
The method of claim 1 wherein said first receptor member is a roller, wherein said second receptor member is a sheet, and wherein said steps of transferrring comprise: passing said recording member bearing said developed image between the said first receptor roller and a pressure roller which urges the said recording member into contact with the first receptor roller; applying a field of one polarity between said rollers to transfer the said developed image to the said first receptor roller; and, then passing a sheet between the said rollers while applying a field of opposite polarity between the said rollers to transfer the developed image from the first receptor roller to said sheet.
Claim 4
Dependent Claim
26 words
The method of claim 1 further comprising at least partially drying the surface of the second receptor surface after the transfer thereto of electroscopic marking particles.
Claim 5
Dependent Claim
41 words
The method of claim 1 wherein the electrostatic field of step (C) is of one polarity, and wherein the electrostatic field of step (D) is of an opposite polarity to reject the developer and deposit it on the second receptor surface.
Claim 6
Dependent Claim
166 words
An electrostatic method for the reproduction of color printed matter comprising the following steps: a. producing an electrostatic latent image on the dielectric surface of an electrostatically chargeable recording member; b. contacting said electrostatic latent image with electroscopic marking particles of a color suspendEd in an insulating carrier liquid to develop said latent image; c. transferring said developed image to an electrically conducting first receptor surface by the simultaneous application of contact and a directional electrostatic field of a polarity to urge the marking particles to said first receptor surface; repeating steps (a) to (c) at least once using electroscopic particles of a different color to form a composite color particle developed image; d. transferring said composite developed image from said first receptor surface to a second receptor surface by the simultaneous application of contact and a directional electrostatic field of a polarity to urge said composite developed image to said second receptor surface; and, e. fixing said composite developed image to said second receptor surface.
Claim 7
Dependent Claim
166 words
An electrostatic method for the reproduction of color printed matter comprising the following steps: a. producing an electrostatic latent image on the dielectric surface of an electrostatically chargeable recording member; b. contacting said electrostatic latent image with electroscopic marking particles of a color suspendEd in an insulating carrier liquid to develop said latent image; c. transferring said developed image to an electrically conducting first receptor surface by the simultaneous application of contact and a directional electrostatic field of a polarity to urge the marking particles to said first receptor surface; repeating steps (a) to (c) at least once using electroscopic particles of a different color to form a composite color particle developed image; d. transferring said composite developed image from said first receptor surface to a second receptor surface by the simultaneous application of contact and a directional electrostatic field of a polarity to urge said composite developed image to said second receptor surface; and, e. fixing said composite developed image to said second receptor surface.
Claim 8
Dependent Claim
27 words
The method of claim 5, wherein said step of contacting includes at least partly drying said developed image prior to transfer to the said first receptor surface.
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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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |