US2791584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing cellulose ethers quickly soluble in cold water
Assignee: Dow Chemical Co
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Filing: 1953-03-20
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Granted: 1957-05-07
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Expires: 1973-03-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:17
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD OF IMPROVING THE SOLUBILITY AND INCREASING THE BULK DENSITY OF A COLD-WATER-SOLUBLE CELLULOSE ETHER WHICH COMPRISES FORMING A MIXTURE OF FROM 2 TO 35 PERCENT BY WEIGHT OF A FIBROUS COLD-WATER-SOLUBLE AND NOT WATER INSOLUBLE CELLULOSE ETHER AND FROM 98 TO 65 PERCENT OF WATER AT A TEMPERATURE ABOVE THE GEL POINT OF THE CELLULOSE ETHER, COOLING THE MIXTURE TO A TEMPERATURE BELOW ITS GEL POINT UNTIL THE FIBROUS STRUCTURE HAS SUBSTANTIALLY DISAPPEARED AND THE MASS HAS BECOME TRANSPARENT, HEATING THE MASS TO ABOVE ITS SYNERESIS TEMPERATURE, THEN DRYING THE MASS WITHOUT ALLOWING THE TEMPERATURE TO DROP BELOW THE GEL POINT, AND REDUCING THE DRIED PRODUCT TO THE DESIRED PARTICLE SIZE.
Claim 2
Independent Claim
113 words
A METHOD OF IMPROVING THE SOLUBILITY AND INCREASING THE BULK DENSITY OF A COLD-WATER-SOLUBLE CELLULOSE ETHER WHICH COMPRISES FORMING A MIXTURE OF FROM 2 TO 35 PERCENT BY WEIGHT OF A FIBROUS COLD-WATER-SOLUBLE AND NOT WATER INSOLUBLE CELLULOSE ETHER AND FROM 98 TO 65 PERCENT OF WATER AT A TEMPERATURE ABOVE THE GEL POINT OF THE CELLULOSE ETHER, COOLING THE MIXTURE TO A TEMPERATURE BELOW ITS GEL POINT UNTIL THE FIBROUS STRUCTURE HAS SUBSTANTIALLY DISAPPEARED AND THE MASS HAS BECOME TRANSPARENT, HEATING THE MASS TO ABOVE ITS SYNERESIS TEMPERATURE, THEN DRYING THE MASS WITHOUT ALLOWING THE TEMPERATURE TO DROP BELOW THE GEL POINT, AND REDUCING THE DRIED PRODUCT TO THE DESIRED PARTICLE SIZE.
References Cited (Backward Citations)
US2331864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |