US2833758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing rapidly soluble cellulose ether powders
Assignee: Henkel AG and Co KGaA
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Filing: 1953-04-03
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Granted: 1958-05-06
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Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Kohler Rudolf
- 👤 Scherff Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE PROCESS OF PRODUCING A FREE-FLOWING GRANULAR POWDER OF A CELLULOSE LOWER ALKYL ETHER SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL CELLULOSE, SAID ETHER HAVING A HIGH SOLUBILITY RATE IN COLD WATER, WHICH COMPRISES THE STEPS OF SUBJECTING A HOT-WATER-INSOLUBLE, COLD-WATER-SOLUBLE FIBROUS CELLULOSE LOWER ALKYL ETHER FREE FROM SALT-FORMING GROUPS AND HAVING A WATER CONTENT OF BETWEEN 50% AND 70% BY WEIGHT, TO A HOMOGENIZING TREATMENT UNDER PRESSURE WHILE MAINTAINING SAID MOIST ETHER AT A TEMPERATURE BETWEEN 0*C. AND 50*C., GRINDING THE MOIST HOMOGENIZED MATERIAL AND THEREAFTER DRYING THE MOIST GROUND PRODUCT AT A TEMPERATURE ABOVE 60*C.
Claim 2
Dependent Claim
99 words
THE PROCESS OF PRODUCING A FREE-FLOWING GRANULAR POWDER OF A CELLULOSE LOWER ALKYL ETHER SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL CELLULOSE, SAID ETHER HAVING A HIGH SOLUBILITY RATE IN COLD WATER, WHICH COMPRISES THE STEPS OF SUBJECTING A HOT-WATER-INSOLUBLE, COLD-WATER-SOLUBLE FIBROUS CELLULOSE LOWER ALKYL ETHER FREE FROM SALT-FORMING GROUPS AND HAVING A WATER CONTENT OF BETWEEN 50% AND 70% BY WEIGHT, TO A HOMOGENIZING TREATMENT UNDER PRESSURE WHILE MAINTAINING SAID MOIST ETHER AT A TEMPERATURE BETWEEN 0*C. AND 50*C., GRINDING THE MOIST HOMOGENIZED MATERIAL AND THEREAFTER DRYING THE MOIST GROUND PRODUCT AT A TEMPERATURE ABOVE 60*C.
References Cited (Backward Citations)
US2331865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |