Patent US2794787A successfully refreshed from Google Patents.
US2794787A
Expired / Lapsed
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Modified gelatins obtained by polymerizing an alkenyl carbonamide in an aqueous gelatin solution
Assignee: Eastman Kodak Co
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Filing: 1952-10-21
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Granted: 1957-06-04
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Expires: 1972-10-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry W Coover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF MODIFYING GELATIN WHICH COMPRISES MIXING ONE PART THEREOF IN AQUEOUS SOLUTION WITH A PEROXY CATALYST AND 1/9-9 PARTS OF A-B-UNSATURATED ALKENYL CARBONAMIDE SELECTED FROM THE GROUP CONSISTING OF THE ACRYLAMIDES, METHACRYLAMIDES, FUMARAMIDES, MALEAMIDES, CITRACONAMIDES AND THE ITACONAMIDES IN WHICH EACH OF THE N-SUBSTITUENTS IN THE AMIDE GROUPS THEREOF ARE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, METHYL, ETHYL, ISOPROPYL, PHENYL AND CRESYL, HEATING THE MASS UNTIL A POLYMER IS FORMED AND COATING OUT THE MAS SO OBTAINED ONTO A FILM-FORMING SURFACE WHEREBY A TOUGH TRANSPARENT GELATIN FILM IS OBTAINED.
Claim 2
Independent Claim
92 words
A METHOD OF MODIFYING GELATIN WHICH COMPRISES MIXING ONE PART THEREOF IN AQUEOUS SOLUTION WITH A PEROXY CATALYST AND 1/9-9 PARTS OF A-B-UNSATURATED ALKENYL CARBONAMIDE SELECTED FROM THE GROUP CONSISTING OF THE ACRYLAMIDES, METHACRYLAMIDES, FUMARAMIDES, MALEAMIDES, CITRACONAMIDES AND THE ITACONAMIDES IN WHICH EACH OF THE N-SUBSTITUENTS IN THE AMIDE GROUPS THEREOF ARE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, METHYL, ETHYL, ISOPROPYL, PHENYL AND CRESYL, HEATING THE MASS UNTIL A POLYMER IS FORMED AND COATING OUT THE MAS SO OBTAINED ONTO A FILM-FORMING SURFACE WHEREBY A TOUGH TRANSPARENT GELATIN FILM IS OBTAINED.
References Cited (Backward Citations)
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 |