Patent US2548537A successfully refreshed from Google Patents.
US2548537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cellulose ester lithographic printing plates
Assignee: Eastman Kodak Co
•
Filing: 1949-02-09
•
Granted: 1951-04-10
•
Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 William O Kenyon
- 👤 Cornelius C Unruh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:50
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; B; B41; B41N; B41N1/00; B41N1/12; B41N1/14; G03F7/016; G03F7/021; G03F7/0212; G03F7/0215; G03F7/039
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF FORMING A DESIGN ON A CELLULOSIC SURFACE FOR PRINTING PURPOSES, WHICH COMPRISES SENSITIZING A HYDROLYZED SURFACE LAYER OF A CELLULOSE ORGANIC ACID ESTER SHEET WITH AN OXIDANT FOR HYDROLYZED CELLULOSE ESTER WHOSE OXIDIZING EFFECT IS ACCELERATED BY LIGHT SELECTED FROM THE BLUE AND ULTRAVIOLET REGIONS OF THE SPECTRUM, EXPOSING SAID SENSITIVE LAYER UNDER A DESIGN, THEREBY OXIDIZING AND RENDERING THE EXPOSED AREA OF SAID SURFACE LAYER REMOVABLE WITH ALKALINE SOLUTION, AND SELECTIVELY REMOVING SAID EXPOSED AREA WITH AN ALKALINE SOLUTION FREE OF OXIDIZING AGENTS.
Claim 2
Independent Claim
87 words
THE METHOD OF FORMING A DESIGN ON A CELLULOSIC SURFACE FOR PRINTING PURPOSES, WHICH COMPRISES SENSITIZING A HYDROLYZED SURFACE LAYER OF A CELLULOSE ORGANIC ACID ESTER SHEET WITH AN OXIDANT FOR HYDROLYZED CELLULOSE ESTER WHOSE OXIDIZING EFFECT IS ACCELERATED BY LIGHT SELECTED FROM THE BLUE AND ULTRAVIOLET REGIONS OF THE SPECTRUM, EXPOSING SAID SENSITIVE LAYER UNDER A DESIGN, THEREBY OXIDIZING AND RENDERING THE EXPOSED AREA OF SAID SURFACE LAYER REMOVABLE WITH ALKALINE SOLUTION, AND SELECTIVELY REMOVING SAID EXPOSED AREA WITH AN ALKALINE SOLUTION FREE OF OXIDIZING AGENTS.
References Cited (Backward Citations)
GB565752A
Cited
US2448861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |