Patent US2861068A successfully refreshed from Google Patents.
US2861068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nitrogen containing cellulose derivatives
Assignee: Eastman Kodak Co
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Filing: 1956-11-01
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Granted: 1958-11-18
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Expires: 1976-11-01
Abstract
No abstract record available.
Inventors
- 👤 Mench John Warren
- 👤 Fulkerson Brazelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:38
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A METHOD OF PREPARING A PRODUCT WHICH IS INSOUBLE IN AND RESISTANT TO WATER BUT IS SOLUBLE IN ORGANIC SOLVENTS AND IN DILUTE AQUEOUS ACID SOLUTIONS HAVING A PH BELOW 5.4 WHICH COMPRISES CHLOROACYLATING IN A SOLUTION ESTERIFICATION PROCEDURE A CELLULOSE DERIVATIVE, SELECTED FROM THE GROUP CONSISTING OF THE LOWR FATTY ACID ESTERS OF CELLULOSE, AT LEAST 1.8, BUT NOT ALL OF THE CELLULOSE HYDROXYLS, PR C6 UNIT OF CELLULOSE HAVING BEEN REPLACED BY LOWER FATTY ACID RADICALS AND THE LOWER ALKYL ETHERS OF CELLULOSE AT LEAST 1/2 BUT NOT ALL OF THE CELLULOSE HYDROXYLS HAVING BEEN REPLACED BY LOWER ALKYL RADICALS, WHEREBY A PRODUCT IS OBTAINED HAVING ITS CHLOROACYL GROUPS ATTACHED ONLY TO THE CELLULOSE, A CHLORINE CONTENT OF AT LEAST 5% AND AN INTERINSIC VISCOSITY OF AT LEAST 0.2 AND REACTING UPON THE CHLOROACYLATED CELLULOSE DERIVATIVE THUS OBTAINED WITH A SECONDARY AMINE UNTIL SUBSTANTIALLY ALL OF THE COMBINED CHLORINE CONTENT OF THE CELLULOSE COMPOUND HAS BEEN REPLACED BY THE GROUP SUPPLIED BY THE AMINE.
Claim 2
Independent Claim
166 words
A METHOD OF PREPARING A PRODUCT WHICH IS INSOUBLE IN AND RESISTANT TO WATER BUT IS SOLUBLE IN ORGANIC SOLVENTS AND IN DILUTE AQUEOUS ACID SOLUTIONS HAVING A PH BELOW 5.4 WHICH COMPRISES CHLOROACYLATING IN A SOLUTION ESTERIFICATION PROCEDURE A CELLULOSE DERIVATIVE, SELECTED FROM THE GROUP CONSISTING OF THE LOWR FATTY ACID ESTERS OF CELLULOSE, AT LEAST 1.8, BUT NOT ALL OF THE CELLULOSE HYDROXYLS, PR C6 UNIT OF CELLULOSE HAVING BEEN REPLACED BY LOWER FATTY ACID RADICALS AND THE LOWER ALKYL ETHERS OF CELLULOSE AT LEAST 1/2 BUT NOT ALL OF THE CELLULOSE HYDROXYLS HAVING BEEN REPLACED BY LOWER ALKYL RADICALS, WHEREBY A PRODUCT IS OBTAINED HAVING ITS CHLOROACYL GROUPS ATTACHED ONLY TO THE CELLULOSE, A CHLORINE CONTENT OF AT LEAST 5% AND AN INTERINSIC VISCOSITY OF AT LEAST 0.2 AND REACTING UPON THE CHLOROACYLATED CELLULOSE DERIVATIVE THUS OBTAINED WITH A SECONDARY AMINE UNTIL SUBSTANTIALLY ALL OF THE COMBINED CHLORINE CONTENT OF THE CELLULOSE COMPOUND HAS BEEN REPLACED BY THE GROUP SUPPLIED BY THE AMINE.
References Cited (Backward Citations)
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Cited
US2072870A
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US2136296A
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US2233475A
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US2518203A
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US2512960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |