Patent US2555446A successfully refreshed from Google Patents.
US2555446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carboxyalkyl cellulose ethers
Assignee: Phillips Petroleum Co
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Filing: 1947-06-06
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Granted: 1951-06-05
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Expires: 1967-06-06
Abstract
No abstract record available.
Inventors
- 👤 William M Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:58
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD FOR THE PRODUCTION OF A COMPLETELY WATER SOLUBLE CARBOXYLALKYL CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF CARBOXYLETHYLCELLLOSE ETHER AND ALKALI METAL SALTS THEREOF AND ALKALI METAL SALTS OF CARBOXYLMETHYLCELLULOSE ETHER FROM SAID CAROBXYLAKLYL CELLULOSE ETHER CONTAINING GEL FORMING MATERIAL NOT SOLUBLE IN WATER COMPRISING ADMIXING WITH WATER A QUANTITY OF SAID CARBOXY-ALKYL CELLULOSE ETHER CONTAINING GEL MATERIAL INSOLUBLE IN WATER, ADDING TO THIS ADMIXTURE A QUANTITY OF A NASCENT OXYGEN YEILDING COMPOUND SUFFICIENT TO PRODUCE SAID COMPLETELY WATER SOLUBLE CARBOXYLALKYL CELLULOSE ETHER.
Claim 2
Independent Claim
85 words
A METHOD FOR THE PRODUCTION OF A COMPLETELY WATER SOLUBLE CARBOXYLALKYL CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF CARBOXYLETHYLCELLLOSE ETHER AND ALKALI METAL SALTS THEREOF AND ALKALI METAL SALTS OF CARBOXYLMETHYLCELLULOSE ETHER FROM SAID CAROBXYLAKLYL CELLULOSE ETHER CONTAINING GEL FORMING MATERIAL NOT SOLUBLE IN WATER COMPRISING ADMIXING WITH WATER A QUANTITY OF SAID CARBOXY-ALKYL CELLULOSE ETHER CONTAINING GEL MATERIAL INSOLUBLE IN WATER, ADDING TO THIS ADMIXTURE A QUANTITY OF A NASCENT OXYGEN YEILDING COMPOUND SUFFICIENT TO PRODUCE SAID COMPLETELY WATER SOLUBLE CARBOXYLALKYL CELLULOSE ETHER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |