US3573040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat desensitizing of convertible plate
Assignee: Fort James Corp
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Filing: 1968-01-22
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Granted: 1971-03-30
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Expires: 1988-01-22
Abstract
Abstract A CONVERTIBLE PLATE ADAPTED FOR CONVERSION BY ELECTROSTATIC PROCEDURES INTO A LITHOGRAPHIC PRINTING PLATE, COMPRISING A SHEET BASE FORMED FROM A PAPER WEB, AND A DIELECTRIC FILM EXTENDING OVER THE SHEET BASE ADAPTED TO RECEIVE AN IMAGE-DEFINING ELECTROSTATIC CHARGE. THE FILM IS DEGRADABLE BY THE APPLICATION OF HEAT. IN PREPARING A PRINTING PLATE FROM THE CONVERTIBLE PLATE, THE IMAGE-DEFINING ELECTROSTATIC CHARGE IS DEVELOPED, AND IN NONIMAGE AREAS THE FILM IS DENSITIZED BYU DEGRADING THE FILM WITH HEAT. THIS RENDERS SUCH NONIMAGE AREAS OF THE FILM HYDROPHILIC, OR WETTABLE WITH AN AQUEOUS FOUNTAIN SOLUTION, IN A LITHOGRAPHIC PRINTING PROCESS.
Inventors
- 👤 Sangho E Back
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:59
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |