US3355288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing method and apparatus
Assignee: Research Laboratories of Australia Pty Ltd
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Filing: 1964-11-17
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Granted: 1967-11-28
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Expires: 1984-11-17
Abstract
No abstract record available.
Inventors
- 👤 Matkan Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/06; G03G15/10; G03G15/101; G03G15/14; G03G15/16; G03G15/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
AN IMPROVED METHOD OF EFFECTING ELECTROSTATIC PRINTING IN WHICH A MASTER HAVING A PHOTOCONDUCTOR SURFACE THEREON CARRYING AN INSULATING SECTION IS CARRIED ON A CYLINDER, AND WHILE THECYLINDER IS ROTATING SUBJECTING THE MASTER TO A CORONA DISCHARGE TO CHARGE THE INSULATING IMAGE BEARING SECTIONS, THEN DISCHARGING THE NON-INSULATING SECTIONS OF THE PHOTOCONDUCTOR SURFACE BY LIGHT, THEN PASSING THECHARGED AREAS THROUGH A DEVELOPER STATION AND APPLYING LIQUID DEVELOPER AGAINST THE SURFACE OF THE MASTER WITHOUT MECHANICAL CONTACT BETWEEN THE APPLICATOR MECHANISM AND THE MASTER, THEN MOVING THE DEVELOPED MASTER TO A STRANSFER STATION WHILE MAINTAINING A FILM OF LIQUID DEVELOPER ON THE MASTER, AND THEN PASSING THE DEVELOPED IMAGE FROM THE MASTER TO A RECEIVING MEMBER CARRIED AROUND A ROLLER SPACED FROM THE FACE OF THE MASTER TO LEAVE A GAP BETWEEN THE SURFACE FACE OF THE MASTER AND THE RECEIVING MEMMBER WHEREIN SUCH GAP IS FILLED BY DEVELOPER LIQUID, AND APPLYIN AN ELECTRICAL FIELD THROUGH THE DEVELOPER IN THE GAP TO RANSFER THE DEVELOPED IMAGE FROM THE MASTER TO THE RECEIVING MEMBER.
Claim 2
Dependent Claim
279 words
A MACHINE FOR EFFECTING ELECTROSTATIC PRINTING COMPRISING A CYLINDER ADAPTED TO CONTAIN A MASTER HAVING INSULATING AND RELATIVELY CONDUCTING SECTIONS FORMING AN IMAGE, A COMBINED CHARGING AND TRANSFER STATION ADJACENT THE CYLINDER INCLUDING A TRANSFER ROLLER OVER WHICH A WEB OF MATERIAL WHICH IS TO RECEIVE THE FINAL PRINT IS PASSED, SAID SPACING OF THE ROLLER IN RELATION TO THE MASTER ON THE CYLINDER BEING SUCH AS TO LEAVE A GAP BETWEEN THE WEB AND THE SURFACE OF THE CYLINDER TO HOLD A FILM OF DEVELOPER LIQUID CARRIED BY THE MASTER AND SAID ROLLER BEING POSITIONED IN RELATION TO THE CYLINDER SO THAT ITS HORIZONTAL AXIS IS WITHIN THIRTY DEGREES OF THE HORIZONTAL CENTERLINE OF THE MASTER CYLINDER, HIGH VOLTAGE GENERATING MEANS TO APPLY A CHARGING CURRENT BETWEEN THE ROLLER AND THE CYLINDER, AND ADEVELOPER STATION ADJACENT THE CYLINDER COMPRISING ROLLERS ADJACENT THE CYLINDER BUT NOT IN CONTACT WITH THE MASTER THEREON MEANS TO SUPPLY DEVELOPER TO THE SAID ROLLERS, MEANS TO DRIVE THE CYLINDER, MEANS TO DRIVE THE TRANSFER ROLLER TO CAUSE THE WEB TO MOVE IN THE SAME DIRECTION AT THE SAME PERIFPHERAL SPEED AS THE MASTER ON THE CYLINDER, AND MEANS TO DRIVE THE DEVELOPER ROLLERS TO LIFT DEVELOPER AGAINST THE MASTER ON THE CYLINDER, THE GAP BETWEEN THE DEVELOPER ROLLERS AND THE CYLINDER BEING SUCH THAT DEVELOPER IS CARRIED FROM THE DEVELOPER STATION TO THE TRANSFER STATION BY THE MASTER ON THE CYLINDER WHEREBY PRINTING OF THE IMAGE ON THE MASTER IS EFFECTED BY LIQUID DEVELOPER APPLIED TO THE SURFACE OF THE MASTER AND TRANSFER IS SIMILARLY EFFECTED BY ELECTRICAL TRANSFER THROUGH A FILM OF LIQUID BETWEEN THE SURFACE OF THE MASTER AND THE WEB.
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) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |