Patent US2698254A successfully refreshed from Google Patents.
US2698254A
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Process for treating a reaction mixture containing hydroxyalkyl cellulose and alkali
Assignee: Hercules Powder Co
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Filing: 1951-03-30
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Granted: 1954-12-28
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Harold M Spurlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; C08B11/02; C08B11/04; C08B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR TREATING A REACTION MIXTURE CONTAINING A HYDROXYALKYL CELLULOSE AND ALKALI TO PREVENT DEGRADATION DURING RETENTION FOR SUBSEQUENT USE OVER A REASONABLE PERIOD OF TIME AND CONSERVE ALKALI VALUES WHICH COMPRISES PASSING CARBON DIOXIDE INTO THE SAID REACTION MIXTURE CONTAINING HYDROXYALKYL CELLULOSE AND ALKALI UNTIL THE FREE ALKALI IS SUBSTANTIALLY CONVERTED TO CARBONATE AND BICARBONATE, PERMITTING THE ALKALI TO REMAIN IN THE FORM OF CARBONATE AND BICARBONATE DURING SUCH RETENTION FOR SUBSEQUENT USE, AND THEN REGENERATING THE SAID ALKALI BY ADDING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE OXIDES AND HYDROXIDES OF CALCIUM STRONTIUM, AND BARIUM AND MIXTURES THEREOF TO CAUSTICIZE THE CARBONATE AND BICARONATE.
Claim 2
Dependent Claim
109 words
A PROCESS FOR TREATING A REACTION MIXTURE CONTAINING A HYDROXYALKYL CELLULOSE AND ALKALI TO PREVENT DEGRADATION DURING RETENTION FOR SUBSEQUENT USE OVER A REASONABLE PERIOD OF TIME AND CONSERVE ALKALI VALUES WHICH COMPRISES PASSING CARBON DIOXIDE INTO THE SAID REACTION MIXTURE CONTAINING HYDROXYALKYL CELLULOSE AND ALKALI UNTIL THE FREE ALKALI IS SUBSTANTIALLY CONVERTED TO CARBONATE AND BICARBONATE, PERMITTING THE ALKALI TO REMAIN IN THE FORM OF CARBONATE AND BICARBONATE DURING SUCH RETENTION FOR SUBSEQUENT USE, AND THEN REGENERATING THE SAID ALKALI BY ADDING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE OXIDES AND HYDROXIDES OF CALCIUM STRONTIUM, AND BARIUM AND MIXTURES THEREOF TO CAUSTICIZE THE CARBONATE AND BICARONATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |