Patent US2768162A successfully refreshed from Google Patents.
US2768162A
Expired / Lapsed
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Quaternary ammonium salts of aminoalkyl cellulose ethers
Assignee: Hercules Powder Co
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Filing: 1951-11-16
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Granted: 1956-10-23
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Expires: 1971-11-16
Abstract
No abstract record available.
Inventors
- 👤 Evan F Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:33
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A WATER-SOLUBLE QUATERNARY AMMONINUM SALT OF AN AMINOAKLYL ETHER OF CELLULOSE CONTAINING AT LEAST ABOUT 0.6 AMINOAKLYL GROUP PER GLCOSE UNIT AND HAVING THE FORMULA
Claim 2
Dependent Claim
29 words
THE PROCESS OF PREPARING A WATER-SOLUBLE QUATERNARY AMMONINUM SALT OF AN AIMINOALKYL ETHER OF CELLULOSE CONTAINING AT LEAST ABOUT 0.6 AMINOALKYL GROUP PER GLUCOSE UNIT AND HAVING THE FORMULA
References Cited (Backward Citations)
US1777970A
Cited
US2120267A
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US2291021A
Cited
US2459222A
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US2545492A
Cited
US2656241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |