US2749336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cellulose derivatives
Assignee: Hercules Powder Co
•
Filing: 1952-04-02
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Granted: 1956-06-05
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Expires: 1972-04-02
Abstract
No abstract record available.
Inventors
- 👤 Floyd L Boddicker
- 👤 Paul E Graybeal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:40
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN THE PREPARATION OF A CELLULOSE ETHER IN A REACTION MIXTURE COMPRISING CELLULOSE, ALKALI, ETHERIFYING AGENT AND SLURRYING MEDIUM, THE IMPROVEMENT WHICH COMPRISES REGULATING THE VISCOSITY OF THE CELLULOSE ETHER BY INTRODUCING INTO THE REACTION MIXTURE ON OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROHALITES, PEROXIDES AND PERIODATES PRIOR TO THE INTRODUCTION TO THE REACTION MIXTURE OF SAID SLURRYING MEDIUM.
Claim 2
Dependent Claim
61 words
IN THE PREPARATION OF A CELLULOSE ETHER IN A REACTION MIXTURE COMPRISING CELLULOSE, ALKALI, ETHERIFYING AGENT AND SLURRYING MEDIUM, THE IMPROVEMENT WHICH COMPRISES REGULATING THE VISCOSITY OF THE CELLULOSE ETHER BY INTRODUCING INTO THE REACTION MIXTURE ON OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROHALITES, PEROXIDES AND PERIODATES PRIOR TO THE INTRODUCTION TO THE REACTION MIXTURE OF SAID SLURRYING MEDIUM.
References Cited (Backward Citations)
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Cited
US2513787A
Cited
US2512338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |