US2854448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of coldwater-soluble forms of cellulose ethers
Assignee: Dow Chemical Co
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Filing: 1956-03-19
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Granted: 1958-09-30
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Expires: 1976-03-19
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Anderson
- 👤 Bernhard V Moeller
- 👤 Merrill H Weymouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:15
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IMPROVED METHOD FOR THE PREPARATION OF GRANULAR FORMS OF CELLULOSE ETHERS HAVING DIRECT COLD-WATER-SOLUBILITY WHICH COMPRISES FORMING A VISCOUS, AQUEOUS SOLUTION OF A COLD-WATER-SOLUBLE HOT-WATER-INSOLUBLE CELLULOSE ETHER CONTAINING BETWEEN ABOUT 2 AND 35 PERCENT BY WEIGHT OF THE ETHER; GELLING THE SOLUTION IN STRANDULAR FORM IN A HOT AQUEOUS BATH MAINTAINED AT A TEMPERATURE ABOVE THE SYNERESIS POINT OF THE ETHER; THEN, WHILE SAID ETHER IS BEING MAINTAINED AT A TEMPERATURE ABOUT 20 TO 30 CENTIGRADE DEGREES ABOVE ITS SYNERESIS POINT, SEQUENTIALLY MECHANICALLY RUPTURING THE STRANDULAR SURFACE OF THE GELLED CELLULOSE ETHER AND MECHANICALLY DEWATERING AND DRYING THE RUPTURED STRANDS; AND FINALLY COMMINUTING THE DRIED CELLULOSE ETHER TO A GRANULAR FORM.
Claim 2
Dependent Claim
111 words
IMPROVED METHOD FOR THE PREPARATION OF GRANULAR FORMS OF CELLULOSE ETHERS HAVING DIRECT COLD-WATER-SOLUBILITY WHICH COMPRISES FORMING A VISCOUS, AQUEOUS SOLUTION OF A COLD-WATER-SOLUBLE HOT-WATER-INSOLUBLE CELLULOSE ETHER CONTAINING BETWEEN ABOUT 2 AND 35 PERCENT BY WEIGHT OF THE ETHER; GELLING THE SOLUTION IN STRANDULAR FORM IN A HOT AQUEOUS BATH MAINTAINED AT A TEMPERATURE ABOVE THE SYNERESIS POINT OF THE ETHER; THEN, WHILE SAID ETHER IS BEING MAINTAINED AT A TEMPERATURE ABOUT 20 TO 30 CENTIGRADE DEGREES ABOVE ITS SYNERESIS POINT, SEQUENTIALLY MECHANICALLY RUPTURING THE STRANDULAR SURFACE OF THE GELLED CELLULOSE ETHER AND MECHANICALLY DEWATERING AND DRYING THE RUPTURED STRANDS; AND FINALLY COMMINUTING THE DRIED CELLULOSE ETHER TO A GRANULAR FORM.
References Cited (Backward Citations)
US2331865A
Cited
US2647064A
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 |