US2618609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of mixture of carboxymethyl cellulose, sodium chloride, and sodium carbonate
Assignee: Imperial Chemical Industries Ltd
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Filing: 1949-07-07
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Granted: 1952-11-18
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Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Charles H Rigby
- 👤 Callum A Macinnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:46
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE MANUFACTURE OF A MIXTURE OF SODIUM CARBOXYMETHYL CELLULOSE, SODIUM CHLORIDE AND SODIUM CARBONATE WHICH COMPRISES FORMING A DAMP REACTION MIXTURE OF CELLULOSE SODIUM HYDROXIDE, SODIUM BICARBONATE, AND A COMPOUND FROM THE GROUP CONSISTING OF CHLORACETIC ACID AND SODIUM SALTS THEREOF, SAID SODIUM HYDROXIDE BEING PRESENT IN EXCESS OF THE AMOUNT REQUIRED FOR THE ETHERIFICATION OF THE CELLULOSE WITH THE CHLORACETIC ACID SO AS TO LEAVE AN UNCONSUMED EXCESS OF THE SODIUM HYDROXIDE ON COMPLETION OF THE SAID ETHERIFICATION REACTION, SAID SODIUM BICARBONATE BEING PRESENT IN AN AMOUNT AT LEAST SUFFICIENT TO CONVERT THE SAID EXCESS SODIUM HYDROXIDE INTO SODIUM CARBONATE, SAID SODIUM BICARBONATE BEING INCORPORATED IN THE REACTION MIXTURE BEFORE THE ETHERIFICATION REACTION HAS PROCEEDED TO ANY SUBSTANTIAL EXTENT.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE MANUFACTURE OF A MIXTURE OF SODIUM CARBOXYMETHYL CELLULOSE, SODIUM CHLORIDE AND SODIUM CARBONATE WHICH COMPRISES FORMING A DAMP REACTION MIXTURE OF CELLULOSE SODIUM HYDROXIDE, SODIUM BICARBONATE, AND A COMPOUND FROM THE GROUP CONSISTING OF CHLORACETIC ACID AND SODIUM SALTS THEREOF, SAID SODIUM HYDROXIDE BEING PRESENT IN EXCESS OF THE AMOUNT REQUIRED FOR THE ETHERIFICATION OF THE CELLULOSE WITH THE CHLORACETIC ACID SO AS TO LEAVE AN UNCONSUMED EXCESS OF THE SODIUM HYDROXIDE ON COMPLETION OF THE SAID ETHERIFICATION REACTION, SAID SODIUM BICARBONATE BEING PRESENT IN AN AMOUNT AT LEAST SUFFICIENT TO CONVERT THE SAID EXCESS SODIUM HYDROXIDE INTO SODIUM CARBONATE, SAID SODIUM BICARBONATE BEING INCORPORATED IN THE REACTION MIXTURE BEFORE THE ETHERIFICATION REACTION HAS PROCEEDED TO ANY SUBSTANTIAL EXTENT.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |