US3689331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrocellulose base compositions and method for making same
Assignee: United States Department of the Army
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Filing: 1964-02-28
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Granted: 1972-09-05
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Expires: 1984-02-28
Abstract
Abstract THE METHOD OF CURING A PROPELLANT COMPOSITION WHICH COMPRISES BRINGING TOGETHER IN INTIMATE ADMIXTURE NITROCELLULOSE AND A NITRATE ESTER PLASTICIZER IN THE PRESENCE OF A CURING AGENT SELECTED FROM THE GROUP CONSISTING OF FERROCENE, FERROCENE DERIVATIVES AND MIXTURES OF THESE, THE AMOUNTS OF SAID NITROCELLULOSE, PLASTICIZER AND CURING AGENT BEING SUFFICIENT TO PROVIDE CONCENTRATIONS THEREOF OF ABOUT 5 TO 30 WEIGHT PERCENT, ABOUT 30 TO 70 WEIGHT PERCENT AND ABOUT 1 TO 5 WEIGHT PERCENT RESPECTIVELY, IN THE RESULTING CURED MIXTURE.
Inventors
- 👤 Everette M Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:19
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/001; C06B25/00; C06B25/18; C06B25/24; C06B25/26
Claims Analysis
Total Claims: 0
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |