Patent US4140881A successfully refreshed from Google Patents.
US2525397A
Expired / Lapsed
US
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Blasting initiator
Assignee: Hercules Powder Co
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Filing: 1945-12-27
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Granted: 1950-10-10
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Expires: 1965-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert W Cairns
- 👤 Robert W Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:06
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |