US2794388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a lithographic printing plate
Assignee: Eastman Kodak Co
•
Filing: 1955-10-25
•
Granted: 1957-06-04
•
Expires: 1975-10-25
Abstract
No abstract record available.
Inventors
- 👤 Lake Orson Warren
- 👤 Charles F Amering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF PREPARING A LITHOGRAPIC PRINTING PLATE HAVING GOOD LITHOGRAPHIC INK RECEPTIVITY AND DURABILITY, WHICH COMPRISES FORMING BY EXPOSURE AND DEVELOPMENT IN A GELATINO-SILVER HALIDE EMULSION LAYER OF UNHARDENED GELATIN, A HARDENED GETATIN IMAGE, TRANSFERRING THE UNHARDENED GELATIN PORTIONS OF SAID EMULSION LAYER TO A LITHOGRAPHIC PRINTING PLATE WHICH WILL REPEL GREASY PRINTING INKS WHEN WET WITH WATER, WETTING THE SURFACE OF THE PRINTING PLATE AND THE TRANSFERRED GELATIN IMAGE WITH A SOLUTION CONTAINING APPROXIMATELY 4% TO 10% TANNIC ACID AND APPROXIMATELY 4% TO 5% THIOUREA, AND THEN WETTING THE SURFACE OF THE PRINTING PLATE WITH WATER AND PLACING IT ON AN OFFSET PRINTING PRESS.
Claim 2
Independent Claim
106 words
THE METHOD OF PREPARING A LITHOGRAPIC PRINTING PLATE HAVING GOOD LITHOGRAPHIC INK RECEPTIVITY AND DURABILITY, WHICH COMPRISES FORMING BY EXPOSURE AND DEVELOPMENT IN A GELATINO-SILVER HALIDE EMULSION LAYER OF UNHARDENED GELATIN, A HARDENED GETATIN IMAGE, TRANSFERRING THE UNHARDENED GELATIN PORTIONS OF SAID EMULSION LAYER TO A LITHOGRAPHIC PRINTING PLATE WHICH WILL REPEL GREASY PRINTING INKS WHEN WET WITH WATER, WETTING THE SURFACE OF THE PRINTING PLATE AND THE TRANSFERRED GELATIN IMAGE WITH A SOLUTION CONTAINING APPROXIMATELY 4% TO 10% TANNIC ACID AND APPROXIMATELY 4% TO 5% THIOUREA, AND THEN WETTING THE SURFACE OF THE PRINTING PLATE WITH WATER AND PLACING IT ON AN OFFSET PRINTING PRESS.
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) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |