US2568503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ester lithographic printing process
Assignee: Eastman Kodak Co
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Filing: 1949-02-09
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Granted: 1951-09-18
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Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 William O Kenyon
- 👤 John A Cathcart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/039
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE METHOD OF FORMING A DESIGN ON A CELLULOSIC SURFACE FOR PRINTING PURPOSES, WHICH COMPRISES SENSITIZING A HYDROLYZED SURFACE LAYER OF A CELULOSE ORGANIC ACID ESTER SHEET WITH A FERRIC SALT REDUCIBLE WITH LIGHT OF THE BLUE AND ULTRA-VIOLET REGIONS OF THE SPECTRUM BUT INCAPABLE OF OXIDATION OF HYDROLYZED CELLULOSE ORGANIC ACID ESTER TO THE ALKALI REMOVABLE STATE IN THE PRESENCE OF SAID LIGHT, EXPOSING SAID SENSITIVE LAYER UNDER A DESIGN THEREBY PRODUCING A FERROUS SALT IMAGE IN THE EXPOSED AREAS, TREATING THE EXPOSED LAYER WITH AN OXIDIZING AGENT OXIDIZING SAID HYDROLYZED CELLULOSE ESTER LAYER ONLY IN THE REGION OF SAID FERROUS SALT IMAGE AND REMOVING THE OXIDIZED MATERIAL WITH AN ALKALINE SOLUTION.
Claim 2
Independent Claim
113 words
THE METHOD OF FORMING A DESIGN ON A CELLULOSIC SURFACE FOR PRINTING PURPOSES, WHICH COMPRISES SENSITIZING A HYDROLYZED SURFACE LAYER OF A CELULOSE ORGANIC ACID ESTER SHEET WITH A FERRIC SALT REDUCIBLE WITH LIGHT OF THE BLUE AND ULTRA-VIOLET REGIONS OF THE SPECTRUM BUT INCAPABLE OF OXIDATION OF HYDROLYZED CELLULOSE ORGANIC ACID ESTER TO THE ALKALI REMOVABLE STATE IN THE PRESENCE OF SAID LIGHT, EXPOSING SAID SENSITIVE LAYER UNDER A DESIGN THEREBY PRODUCING A FERROUS SALT IMAGE IN THE EXPOSED AREAS, TREATING THE EXPOSED LAYER WITH AN OXIDIZING AGENT OXIDIZING SAID HYDROLYZED CELLULOSE ESTER LAYER ONLY IN THE REGION OF SAID FERROUS SALT IMAGE AND REMOVING THE OXIDIZED MATERIAL WITH AN ALKALINE SOLUTION.
References Cited (Backward Citations)
GB337868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |