US2635098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellulose triesters
Assignee: COURTANLDS Ltd
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Filing: 1951-12-03
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Granted: 1953-04-14
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Expires: 1971-12-03
Abstract
No abstract record available.
Inventors
- 👤 Godfrey J Cave
- 👤 Hampson Henry
- 👤 John P Stoneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
C; C08; C08B; C08B17/00; C08B17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR THE PRODUCTION OF CELLULOSE TRIESTERS COMPRISING FORMING A STATIC BED OF CELLULOSE PRETREATED WITH THE APPROPRIATE FATTY ACID, CIRCULATING A LIQUID CONSISTING OF A FATTY ACID ANHYDRIDE AND AT LEAST ONE INERT SOLVENT THROUGH THE BED OF CELLULOSE, ADDING AN ESTERFICATION CATALYST TO THE CIRCULATING LIQUID AT A POINT REMOVED FROM THE BED OF CELLULOSIC MATERIAL SO THAT REACTION IS INITIATED BETWEEN WATER REMOVED FROM THE CELLULOSE AND THE ANHYDRIDE, REMOVING THE RESULTANT HEAT OF REACTION FROM THE CIRCULATING LIQUID WHILE THE LIQUID IS MAINTAINED OUT OF CONTACT WITH THE CELLULOSIC MATERIAL AND THEN PASSING THE RESULTANT ESTERIFICATION LIQUID THROUGH THE BED OF CELLULOSIC MATERIAL UNTIL THE CELLULOSE HAS BEEN CONVERTED SUBSTANTIALLY INTO A CELLULOSE TRIESTER.
Claim 2
Dependent Claim
119 words
A PROCESS FOR THE PRODUCTION OF CELLULOSE TRIESTERS COMPRISING FORMING A STATIC BED OF CELLULOSE PRETREATED WITH THE APPROPRIATE FATTY ACID, CIRCULATING A LIQUID CONSISTING OF A FATTY ACID ANHYDRIDE AND AT LEAST ONE INERT SOLVENT THROUGH THE BED OF CELLULOSE, ADDING AN ESTERFICATION CATALYST TO THE CIRCULATING LIQUID AT A POINT REMOVED FROM THE BED OF CELLULOSIC MATERIAL SO THAT REACTION IS INITIATED BETWEEN WATER REMOVED FROM THE CELLULOSE AND THE ANHYDRIDE, REMOVING THE RESULTANT HEAT OF REACTION FROM THE CIRCULATING LIQUID WHILE THE LIQUID IS MAINTAINED OUT OF CONTACT WITH THE CELLULOSIC MATERIAL AND THEN PASSING THE RESULTANT ESTERIFICATION LIQUID THROUGH THE BED OF CELLULOSIC MATERIAL UNTIL THE CELLULOSE HAS BEEN CONVERTED SUBSTANTIALLY INTO A CELLULOSE TRIESTER.
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) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |