US2667480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ether
Assignee: EIDP Inc
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Filing: 1950-07-05
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Granted: 1954-01-26
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Expires: 1970-07-05
Abstract
No abstract record available.
Inventors
- 👤 Branan Wiley Monroe
- 👤 Desetti Gild Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:57
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PREPARATION OF WATERSOLUBLE SODIUM CARBOXYMETHYL CELLULOSE WHICH COMPRISES ADDING TO WATER MOISTENED ALKALI CELLULOSE, AT A TEMPERATURE NO HIGHER THAN ABOUT 30* C. SUFFICIENT ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF MONOCHLOROACETIC ACID AND SODIUM MONOCHLOROACETATE TO PROVIDE A DEGREE OF ETHERIFICATION WHICH RENDERS TO PRODUCT WATER-SOLUBLE, AGITATING THE MASS WITHIN THE AFORMENTIONED TEMPERATURE LIMIT UNTIL THOROUGH MIXING IS OBTAINED AND THEREAFTER SUBJECTING IT TO UNIFORM HEATING AT A TEMPERATURE SUFFICIENT TO CAUSE CONCURRENT ETHERIFICATION AND WATER VAPORIZATION THEREBY PRODUCING A SUBSTANTIALLY DRY, WATER-SOLUBLE PRODUCT.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PREPARATION OF WATERSOLUBLE SODIUM CARBOXYMETHYL CELLULOSE WHICH COMPRISES ADDING TO WATER MOISTENED ALKALI CELLULOSE, AT A TEMPERATURE NO HIGHER THAN ABOUT 30* C. SUFFICIENT ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF MONOCHLOROACETIC ACID AND SODIUM MONOCHLOROACETATE TO PROVIDE A DEGREE OF ETHERIFICATION WHICH RENDERS TO PRODUCT WATER-SOLUBLE, AGITATING THE MASS WITHIN THE AFORMENTIONED TEMPERATURE LIMIT UNTIL THOROUGH MIXING IS OBTAINED AND THEREAFTER SUBJECTING IT TO UNIFORM HEATING AT A TEMPERATURE SUFFICIENT TO CAUSE CONCURRENT ETHERIFICATION AND WATER VAPORIZATION THEREBY PRODUCING A SUBSTANTIALLY DRY, WATER-SOLUBLE PRODUCT.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |