Patent US2776966A successfully refreshed from Google Patents.
US2776966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of nitrocellulose
Assignee: Hercules Powder Co
•
Filing: 1956-03-28
•
Granted: 1957-01-08
•
Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 Jr James G Mcmillan
- 👤 Warren L Plunkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:24
CPC Classifications
C; C08; C08B; C08B17/00; C08B17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PREPARING NITRIC ACID ESTERS OF CELLULOSE WHICH COMPRISES CONTINUOUSLY IMMERSING A SHEET OF CELLULOSE IN A NITRATING BATH 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 ESTER OF ENT 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, CONTINUOUSLY REMOVING THE NITRATED SHEET FROM THE NITRATING BATH, AND CONTINUOUSLY PROGRESSING THE NITRATED SHEET THROUGH A PLURALITY OF SEGREGATED WASHES IN WHICH SHEET THROUGH A PLURALITY OF SEGIS OF DECREASED NITRIC ACID CONTENT AND INCREASED WATER CONTENT.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PREPARING NITRIC ACID ESTERS OF CELLULOSE WHICH COMPRISES CONTINUOUSLY IMMERSING A SHEET OF CELLULOSE IN A NITRATING BATH 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 ESTER OF ENT 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, CONTINUOUSLY REMOVING THE NITRATED SHEET FROM THE NITRATING BATH, AND CONTINUOUSLY PROGRESSING THE NITRATED SHEET THROUGH A PLURALITY OF SEGREGATED WASHES IN WHICH SHEET THROUGH A PLURALITY OF SEGIS OF DECREASED NITRIC ACID CONTENT AND INCREASED WATER CONTENT.
References Cited (Backward Citations)
No citation records indexed.
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 |