Patent US2517835A successfully refreshed from Google Patents.
US2517835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of low viscosity carboxyalkyl cellulose
Assignee: EIDP Inc
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Filing: 1947-11-21
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Granted: 1950-08-08
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Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 Wiley M Branan
- 👤 Harrison H Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:37
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN THE PRODUCTION OF WATER-SOLUBLE SALTS OF CARBOXYALKYLCELLULOSE ETHERS OF REDUCED VISCOSITY, THE PROCESS WHICH COMPRISES ADDING TO THE REACTION MIXTURE, AFTER TREATMENT OF CELLULOSE WITH CAUSTIC ALKALI AND AN ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF HALOGEN SUBSTITUED FATTY ACIDS AND ALKALI SALTS OF HALOGEN SUBSTITUTED FATTY ACIDS, A COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF MANGANESE, COBALT, NICKEL AND VANADIUM IN THE RATIO OF ONE PART OF ELEMENTAL METAL TO BETWEEN 1,000 AND 30,000 PARTS OF CELLULOSE BY WEIGHT.
Claim 2
Dependent Claim
85 words
IN THE PRODUCTION OF WATER-SOLUBLE SALTS OF CARBOXYALKYLCELLULOSE ETHERS OF REDUCED VISCOSITY, THE PROCESS WHICH COMPRISES ADDING TO THE REACTION MIXTURE, AFTER TREATMENT OF CELLULOSE WITH CAUSTIC ALKALI AND AN ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF HALOGEN SUBSTITUED FATTY ACIDS AND ALKALI SALTS OF HALOGEN SUBSTITUTED FATTY ACIDS, A COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF MANGANESE, COBALT, NICKEL AND VANADIUM IN THE RATIO OF ONE PART OF ELEMENTAL METAL TO BETWEEN 1,000 AND 30,000 PARTS OF CELLULOSE BY WEIGHT.
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) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |