Patent US1669234A successfully refreshed from Google Patents.
Patent US3761465A successfully refreshed from Google Patents.
US3761465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of water soluble derivatives of cellulose and compositions thereof
Assignee: Individual
•
Filing: 1971-09-30
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Granted: 1973-09-25
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Expires: 1991-09-30
Abstract
Abstract A PROCESS FOR THE PREPARATION OF WATER-SOLUBLE CELLULOSE DERIVATIVES, PRINCIPALLY CARBOXY METHYL CELLULOSE, BY REACTION BETWEEN PARTIALLY HYDROLYZED OR SOLVATED CELLULOSE, BY REACTION BETWEEN PARTIALLY HYDROLYZED OR SOLVATED CELLULOSE AND A MONOHALOACETONITRILE. IN A PREFERRED REACTION, E.G., MONOCHLOROACETONITRILE IS REACTED WITH ALKALI CELLULOSE AT RELATIVELY LOW TEMPERATURES, WITH OR WITHOUT A CARRIER SOLVENT, TO OBTAIN WATER-SOLUBLE CELLULOSE DERIVATIVES, INCLUDING PARTICULARLY CARBOXY METHYL CELLULOSE AND MIXED ETHERS OF CARBOXY METHYL CELLULOSE AND CARBAMYL METHYL CELLULOSE.
Inventors
- 👤 C Callihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12; C08B11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |