Patent US2854445A successfully refreshed from Google Patents.
US2854445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for the esterification of cellulose in homogeneous phase
Assignee: Rhodiaceta SA
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Filing: 1957-03-05
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Granted: 1958-09-30
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Expires: 1977-03-05
Abstract
No abstract record available.
Inventors
- 👤 Clevy Roland
- 👤 Robin Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:00
CPC Classifications
C; C08; C08B; C08B17/00; C08B17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE CONTINUOUS ESTERIFICATION OF CELLULOSE IN HOMOGENEOUS PHASE CONSISTING ESSENTIALLY IN CONTINUOUSLY TREATING THE CELLULOSE WITH ESTERIFYING AGENTS, CAUSING THE RESULTING REACTION MASS TO UNDERGO AN OVERALL DISPLACEMENT WITH A COMBINED ROTARY AND RECIPROCATING MOVEMENT IN A CYLINDRICAL REACTION ZONE HAVING A SUBSTANTIALLY HORIZONTAL AXIS FROM A POINT OF ENTRY TOWARDS A DISCHARGE ZONE, WHILE SUBJECTING THE SAID MASS IN SAID DISCHARGE ZONE TO A PREDETERMINED COUNTER PRESSURE IN A A DIRECTION OPPOSED TO THAT OF THE OVERALL DISPLACEMENT AND PRODUCED FROM A SOURCE OUTSIDE OF SAID REACTION ZONE, AND REGULATING THE TEMPERATURE OF THE SAID MASS WHILE IN THE REACTION ZONE BY THERMAL EXCHANGE WITH A TEMPERATURE CONTROL FLUID.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE CONTINUOUS ESTERIFICATION OF CELLULOSE IN HOMOGENEOUS PHASE CONSISTING ESSENTIALLY IN CONTINUOUSLY TREATING THE CELLULOSE WITH ESTERIFYING AGENTS, CAUSING THE RESULTING REACTION MASS TO UNDERGO AN OVERALL DISPLACEMENT WITH A COMBINED ROTARY AND RECIPROCATING MOVEMENT IN A CYLINDRICAL REACTION ZONE HAVING A SUBSTANTIALLY HORIZONTAL AXIS FROM A POINT OF ENTRY TOWARDS A DISCHARGE ZONE, WHILE SUBJECTING THE SAID MASS IN SAID DISCHARGE ZONE TO A PREDETERMINED COUNTER PRESSURE IN A A DIRECTION OPPOSED TO THAT OF THE OVERALL DISPLACEMENT AND PRODUCED FROM A SOURCE OUTSIDE OF SAID REACTION ZONE, AND REGULATING THE TEMPERATURE OF THE SAID MASS WHILE IN THE REACTION ZONE BY THERMAL EXCHANGE WITH A TEMPERATURE CONTROL FLUID.
References Cited (Backward Citations)
US1859579A
Cited
US2505125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |