US2768162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts of aminoalkyl cellulose ethers
Assignee: Hercules Powder Co
•
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 06:12
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
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US2120267A
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US2291021A
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US2459222A
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US2545492A
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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 |