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US2957415A
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Safety device for electric primers for mines, to protect against ignition by stray electric currents
Assignee: Montedison SpA
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Filing: 1956-11-02
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Granted: 1960-10-25
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Expires: 1976-11-02
Abstract
No abstract record available.
Inventors
- 👤 Fabrizio Lazari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:17
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/02; C07C23/10; C07C23/12; B; B01; B01J; B01J2/00; B01J2/24; F; F42; F42B; F42B3/00; F42B3/10; F42B3/18; F42B3/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1726053A
Cited
GB375536A
Cited
US2026962A
Cited
US2494256A
Cited
GB677824A
Cited
US2632389A
Cited
US2704032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |