US2776965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitric acid esters of cellulose and method of preparation
Assignee: Hercules Powder Co
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Filing: 1956-03-28
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Granted: 1957-01-08
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Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 James L Bennett
- 👤 Robert M Brooks
- 👤 Jr James G Mcmillan
- 👤 Warren L Plunkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCES FOR PREPARING NITRIC ACID ESTERS OF CELLULOSE WHICH COMPRISES REACTING CELULOSE WITH AN EXCESS OVER THEORETICAL STIOCHIOMETRIC REQUIREMENTS OF NITRATING MIXTURE CONTAINING ESSENTIALLY NITRIC ACID, MAGNESIUM NITRATE AND WATER, THE RATIO OF MAGNESIUM NITRATE TO WATER BEING AT LEAST ABOUT 1.2:1 AND NOT MORE THAN ABOUT 2.2:1 BY WEIGHT, AND SAID NITRIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO YIELD A NITRIC ACID ESTER OF CELLULOSE HAVING A NITROGEN CONTENT OF FROM ABOUT 11% TO ABOUT 13.5% BY WEIGHT.
Claim 2
Dependent Claim
82 words
A PROCES FOR PREPARING NITRIC ACID ESTERS OF CELLULOSE WHICH COMPRISES REACTING CELULOSE WITH AN EXCESS OVER THEORETICAL STIOCHIOMETRIC REQUIREMENTS OF NITRATING MIXTURE CONTAINING ESSENTIALLY NITRIC ACID, MAGNESIUM NITRATE AND WATER, THE RATIO OF MAGNESIUM NITRATE TO WATER BEING AT LEAST ABOUT 1.2:1 AND NOT MORE THAN ABOUT 2.2:1 BY WEIGHT, AND SAID NITRIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO YIELD A NITRIC ACID ESTER OF CELLULOSE HAVING A NITROGEN CONTENT OF FROM ABOUT 11% TO ABOUT 13.5% BY WEIGHT.
References Cited (Backward Citations)
US2400287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |