US3728331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing the viscosity of a cellulose ether with hydrogen peroxide
Assignee: Dow Chemical Co
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Filing: 1969-04-04
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Granted: 1973-04-17
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Expires: 1989-04-04
Abstract
Abstract A CONTROLLED REDUCTION OF THE VISCOSITY OF A CELLULOSE ETHER IS ACHIEVED BY BLENDING AN ESSENTIALLY DRY, FREEFOWING PARTICULATE CELLULOSE ETHER WITH A PREDETERMINED AMOUNT OF HYDROGEN PEROXIDE, HEATING THE BLENDED CELLULOSE ETHER AT ABOUT 50*-150*C. TO REACT SUBSTANTIALLY ALL THE ADDED HYDROGEN PEROXIDE, AND RECOVERING A LOWER VISCOSITY, PARTICULATE CELLULOSE ETHER HAVING AN INTRINSIC FLUIDITY GREATER THAN THE INITIAL CELLULOSE ETHER. HIGH YIELDS AND A READILY CONTROLLED VISCOSITY REDUCTION AE OBTAINED.
Inventors
- 👤 A Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:42
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |