US3597293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making laminated molded resinous printing plates
Assignee: WR Grace and Co
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Filing: 1969-10-08
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Granted: 1971-08-03
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Expires: 1989-10-08
Abstract
Abstract PRINTING PLATES EXHIBITING MINIMAL THERMAL SHRINKAGE ARE MADE BY MOLDING A LAMINAR PRINTING PLATE BLANK AGAINST A MATRIX. THE WORKING FACE (THE TOP LAMINATION) CONTAINS CARBON BLACK OR A CONDUCTIVE SUBSTANCE, AND IS SUBSTANTIALLY THINNER THAN THE SUPPORTING LAMINATION USUALLY FORMED OF THE SAME RESIN BUT CONTAINING NO CONDUCTIVE SUBSTANCE. MOLDING PREFERABLY TAKES PLACE IN A CHAMBER AT REDUCED ATMOSPHERIC PRESSURE. HEATING IS ACCOMPLISHED BY HIGH FREQUENCY ELECTRIC CURRENT. SINCE ONLY THE FACE CAN BE HEATED IN THE DIELECTRIC FIELD AND THE THICKER BASE REMAINS COOL, SHRINKAGE IS GREATLY REDUCED.
Inventors
- 👤 John A Willett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:49
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; B; B29; B29C; B29C43/00; B32; B32B; B32B27/00; B41; B41C; B41C3/00; B41C3/06; B41N; B41N1/00; B41N1/12; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |