US2801237A
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: 1953-01-13
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Granted: 1957-07-30
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Expires: 1973-01-13
Abstract
No abstract record available.
Inventors
- 👤 Clevy Roland
- 👤 Robin Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:22
CPC Classifications
C; C08; C08B; C08B17/00; C08B17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR THE ESTERIFICATION IN HOMOGENEOUS PHASE OF CELLULOSE, WHICH COMPRISES CONTINUOUSLY TREATING CELLULOSE WITH ESTERIFYING AGENTS TO PRODUCE A REACTION MASS WHILE ADVANCING THE REACTION MASS THROUGH A CYLINDRICAL REACTION ZONE IN A GENERALLY HELICAL PATH WITH AXIAL RECIPROCATING MOVEMENT TO CAUSE THE MASS TO ADVANCE AND RETRACT ALTERNATELY AS IT PROGRESS TO A DISCHARGE POINT, WHILE REGULATING THE TEMPERATURE OF SAID REACTION MASS BY HEAT EXCHANGE WITH A FLUID BOTH AT THE AXIS OF AND AROUND THE PERIPHERY OF SAID CYLINDRICAL ZONE TO MAINTAIN A UNIFORM TEMPERATURE THROUGHOUT THE CROSS SECTION OF SAID MASS.
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE ESTERIFICATION IN HOMOGENEOUS PHASE OF CELLULOSE, WHICH COMPRISES CONTINUOUSLY TREATING CELLULOSE WITH ESTERIFYING AGENTS TO PRODUCE A REACTION MASS WHILE ADVANCING THE REACTION MASS THROUGH A CYLINDRICAL REACTION ZONE IN A GENERALLY HELICAL PATH WITH AXIAL RECIPROCATING MOVEMENT TO CAUSE THE MASS TO ADVANCE AND RETRACT ALTERNATELY AS IT PROGRESS TO A DISCHARGE POINT, WHILE REGULATING THE TEMPERATURE OF SAID REACTION MASS BY HEAT EXCHANGE WITH A FLUID BOTH AT THE AXIS OF AND AROUND THE PERIPHERY OF SAID CYLINDRICAL ZONE TO MAINTAIN A UNIFORM TEMPERATURE THROUGHOUT THE CROSS SECTION OF SAID MASS.
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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |