US2678310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose nitration
Assignee: Hercules Powder Co
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Filing: 1951-11-03
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Granted: 1954-05-11
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Expires: 1971-11-03
Abstract
No abstract record available.
Inventors
- 👤 Robert M Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:28
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
THE METHO OF PARTIALLY NITRATING A CELLULOSIC MATERIAL WHICH COMPRISES CONTACTING SAID CELLULOSIC MATERIAL WITH AN AQUEOUS NITRIC ACID SOLUTION CONTAINING FROM 89 TO 95 WEIGHT PER CENT NITRIC ACID AT A TEMPERATURE WITHIN THE RANGE OF -20* TO 0* C. FOR A PERIOD OF TIME WITHIN THE RANGE OF 10 TO 20 MINUTES AND UNTIL THE NITRATED CELLULOSE CONTAINS AT LEAST 9% NITROGEN.
References Cited (Backward Citations)
US1913416A
Cited
US2377435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |