Patent US3136045A successfully refreshed from Google Patents.
Patent US2834776A successfully refreshed from Google Patents.
US2834776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing hydrolyzed cellulose acetate butyrates
Assignee: Eastman Kodak Co
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Filing: 1953-12-09
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Granted: 1958-05-13
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Expires: 1973-12-09
Abstract
No abstract record available.
Inventors
- 👤 Carl J Malm
- 👤 Jr Loring W Blanchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:19
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/16; C08B3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD FOR PREPARING A HYDROLYZED CELLULOSE ACETATE-BUTYRATE OF GOOD UNIFORMITY AND WHICH WILL DISSOLVE IN SOLVENTS THEREFOR WITHOUT HAZE OR GRAIN, WHICH COMPRISES REACTING UPON CELLULOSE WITH AN ESTERFICATION BATH ESSENTIALLY CONSISTING, EXCEPT FOR THE CATALYST, ONLY OF ACETIC AND BUTYRIC COMPOUNDS, THE MOL RATIO OF BUTYRYL TO ACETYL BEING GREATER THAN 1, IN WHICH THE LIQUID TO CELLULOSE RATIO DOES NOT EXCEED 8:1, AND HYDROLYZING THE THUS PREPARED CELLULOSE ACETATE BUTYRATE BY ALLOWING IT TO STAND IN SOLUTION IN THE HYDROLYSIS BATH OBTAINED BY DILUTION OF THE SPENT ESTERIFICATION MASS WITH ACETIC ACID AND AQUEOUS ACETIC ACID TO THE POINT WHERE THE RATIO OF LIQUID TO CELLULOSE ESTER IS WITHIN THE RATIO OF 8:1 TO 10:1 BY WEIGHT AND ACETIC ACID IS THE PREDOMINATING ACID THEREIN.
Claim 2
Independent Claim
128 words
A METHOD FOR PREPARING A HYDROLYZED CELLULOSE ACETATE-BUTYRATE OF GOOD UNIFORMITY AND WHICH WILL DISSOLVE IN SOLVENTS THEREFOR WITHOUT HAZE OR GRAIN, WHICH COMPRISES REACTING UPON CELLULOSE WITH AN ESTERFICATION BATH ESSENTIALLY CONSISTING, EXCEPT FOR THE CATALYST, ONLY OF ACETIC AND BUTYRIC COMPOUNDS, THE MOL RATIO OF BUTYRYL TO ACETYL BEING GREATER THAN 1, IN WHICH THE LIQUID TO CELLULOSE RATIO DOES NOT EXCEED 8:1, AND HYDROLYZING THE THUS PREPARED CELLULOSE ACETATE BUTYRATE BY ALLOWING IT TO STAND IN SOLUTION IN THE HYDROLYSIS BATH OBTAINED BY DILUTION OF THE SPENT ESTERIFICATION MASS WITH ACETIC ACID AND AQUEOUS ACETIC ACID TO THE POINT WHERE THE RATIO OF LIQUID TO CELLULOSE ESTER IS WITHIN THE RATIO OF 8:1 TO 10:1 BY WEIGHT AND ACETIC ACID IS THE PREDOMINATING ACID THEREIN.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |