Patent US1978403A successfully refreshed from Google Patents.
US2632007A
Expired / Lapsed
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Rapid esterification of cellulose using a basic catalyst
Assignee: EIDP Inc
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Filing: 1951-05-05
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Granted: 1953-03-17
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Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Blume Roe Calvin
- 👤 Swezey Fenton Hendy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:52
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE PRODUCTION OF CELLULOSE ESTERS WHICH COMPRISES ESTERIFYING CELLULOSE WITH AN ANHYDRIDE OF A LOWER FATTY ACID IN THE PRESENCE OF A POTASSIUM SALT OF A LOWER FATTY ACID AS A CATALYST AND AN ORGANIC AMIDE ACTIVATOR FROM THE GROUP CONSISTING OF N,N-DIALKYLAMIDE AND N-ACYLMORPHOLINE.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE PRODUCTION OF CELLULOSE ESTERS WHICH COMPRISES ESTERIFYING CELLULOSE WITH AN ANHYDRIDE OF A LOWER FATTY ACID IN THE PRESENCE OF A POTASSIUM SALT OF A LOWER FATTY ACID AS A CATALYST AND AN ORGANIC AMIDE ACTIVATOR FROM THE GROUP CONSISTING OF N,N-DIALKYLAMIDE AND N-ACYLMORPHOLINE.
References Cited (Backward Citations)
US1930895A
Cited
US2536634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |