US2591748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphoteric cellulose derivatives
Assignee: Hercules Powder Co
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Filing: 1949-12-23
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Granted: 1952-04-08
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Expires: 1969-12-23
Abstract
No abstract record available.
Inventors
- 👤 Charles L P Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:58
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12; C08B11/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
AN AMPHOTERIC CELLULOSE COMPOUND CONSISTING OF A CELLULOSE ETHER CONTAINING AT LEAST ABOUT 0.15 DIALKYLAMINOALKYL GROUP PER ANHYDROGLUCOSE UNIT AND AT LEAST ABOUT 0.1 OF AN ACIDIC GROUP PER ANHYDROGLUCOSE UNIT, TO TOTAL OF THESE GROUP AMOUNTING TO A SUBSTITUTION OF AT LEAST ABOUT 0.4 PER ANHYDROGLUCOSE UNIT, SAID CELLULOSE ETHER HAVING THE FORMULA
Claim 2
Dependent Claim
54 words
AN AMPHOTERIC CELLULOSE COMPOUND CONSISTING OF A CELLULOSE ETHER CONTAINING AT LEAST ABOUT 0.15 DIALKYLAMINOALKYL GROUP PER ANHYDROGLUCOSE UNIT AND AT LEAST ABOUT 0.1 OF AN ACIDIC GROUP PER ANHYDROGLUCOSE UNIT, TO TOTAL OF THESE GROUP AMOUNTING TO A SUBSTITUTION OF AT LEAST ABOUT 0.4 PER ANHYDROGLUCOSE UNIT, SAID CELLULOSE ETHER HAVING THE FORMULA
References Cited (Backward Citations)
US2136296A
Cited
US2476331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |