US2827455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lower aliphatic acid ester of cellulose from wood pulp
Assignee: Celanese Corp
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Filing: 1955-07-15
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Granted: 1958-03-18
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Expires: 1975-07-15
Abstract
No abstract record available.
Inventors
- 👤 Robert H Wells
- 👤 Blanche B White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
PROCESS FOR THE PRODUCTION OF LOWER ALIPHATIC ACID ESTERS OF CELLULOSE, WHICH COMPRISES CONTACTING WATER-CONTAINING WOOD PULP CELLULOSE WITH A LOWER ALIPHATIC ACID, THEN CONTACTING THE SAID CELLULOSE WITH A LOWER ALIPHATIC ACID ANHYDRIDE IN AN AMOUNT SUFFICIENT TO REACT WITH ALL THE WATER THEREIN IN THE PRESENCE OF A SUBSTANCE THAT WILL CATALYZE THE REACTION BETWEEN THE ANHYDRIDE AND THE WATER, AND ESTERIFYING THE CELLULOSE WITH A MIXTURE CONTAINING A LOWER ALIPHATIC ACID ANHYDRIDE AND A WATER-IMMISCIBLE SOLVENT FOR THE ESTER BEING FORMED.
Claim 2
Dependent Claim
84 words
PROCESS FOR THE PRODUCTION OF LOWER ALIPHATIC ACID ESTERS OF CELLULOSE, WHICH COMPRISES CONTACTING WATER-CONTAINING WOOD PULP CELLULOSE WITH A LOWER ALIPHATIC ACID, THEN CONTACTING THE SAID CELLULOSE WITH A LOWER ALIPHATIC ACID ANHYDRIDE IN AN AMOUNT SUFFICIENT TO REACT WITH ALL THE WATER THEREIN IN THE PRESENCE OF A SUBSTANCE THAT WILL CATALYZE THE REACTION BETWEEN THE ANHYDRIDE AND THE WATER, AND ESTERIFYING THE CELLULOSE WITH A MIXTURE CONTAINING A LOWER ALIPHATIC ACID ANHYDRIDE AND A WATER-IMMISCIBLE SOLVENT FOR THE ESTER BEING FORMED.
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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |