Patent US2997954A successfully refreshed from Google Patents.
US2997954A
Expired / Lapsed
US
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Cartridge shells and method for manufacture
Assignee: Hercules Powder Co
•
Filing: 1957-01-31
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Granted: 1961-08-29
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Expires: 1977-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jr David R Blair
- 👤 John R Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:57
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2604830A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |