Patent US3306202A successfully refreshed from Google Patents.
US3306202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric initiator
Assignee: Individual
•
Filing: 1964-12-02
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Granted: 1967-02-28
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Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Vincent J Menichelli
- 👤 Kabik Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
AN ELECTRIC INITIATOR FOR EXPLOSIVES WHICH IS INSENSITIVE TO THE APPLICATION OF ELECTRICAL CURRENTS OR ELECTRICAL POWER BELOW A PREDETERMINED LEVEL WHICH IS ABOVE THE LEVEL USUALLY REQUIRED TO FIRE SUCH DEVICES AND WHICH WILL RELIABLY FUNCTION WHEN ELECTRICAL CURRENTS OR ELECTRICAL POWER ABOVE ANOTHER PREDETERMINED LEVEL IS APPLIED, COMPRISING A METALLIC RECEPTACLE HAVING A CLOSED END AND AN OPEN END, A MAIN CHARGE OF EXPLOSIVE IN SAID RECEPTACLE ADJACENT SAID CLOSED END, A CUP-SHAPED METALLIC CHARGE HOLDER HAVING ITS BASE IN CONTIGUOUS RELATION TO SAID MAIN CHARGE AND ITS SIDEWALL CONTACTING SAID RECEPTACLE, SAID CHARGE HOLDER HAVING A BORE THROUGH ITS BASE, A HEAT SENSITIVE EXPLOSIVE CHARGE DISPOSED IN SAID BORE AND IN CONTACT WITH SAID MAIN CHARGE, AN INSULATING DISK IN THE BOTTOM OF SAID CHARGE HOLDER, SAID DISK HAVING A BORE THERETHROUGH IN AXIAL ALIGNMENT WITH THE BORE IN SAID HOLDER, A RESISTANCE HEATING ELEMENT SPANNING THE BORE IN SAID DISK, AND IN CONTACT WITH SAID HEAT SENSITIVE EXPLOSIVE CHARGE, SAID ELEMENT COMPRISING A FLAT STRIP OF CONDUCTIVE METAL,
Claim 2
Dependent Claim
172 words
AN ELECTRIC INITIATOR FOR EXPLOSIVES WHICH IS INSENSITIVE TO THE APPLICATION OF ELECTRICAL CURRENTS OR ELECTRICAL POWER BELOW A PREDETERMINED LEVEL WHICH IS ABOVE THE LEVEL USUALLY REQUIRED TO FIRE SUCH DEVICES AND WHICH WILL RELIABLY FUNCTION WHEN ELECTRICAL CURRENTS OR ELECTRICAL POWER ABOVE ANOTHER PREDETERMINED LEVEL IS APPLIED, COMPRISING A METALLIC RECEPTACLE HAVING A CLOSED END AND AN OPEN END, A MAIN CHARGE OF EXPLOSIVE IN SAID RECEPTACLE ADJACENT SAID CLOSED END, A CUP-SHAPED METALLIC CHARGE HOLDER HAVING ITS BASE IN CONTIGUOUS RELATION TO SAID MAIN CHARGE AND ITS SIDEWALL CONTACTING SAID RECEPTACLE, SAID CHARGE HOLDER HAVING A BORE THROUGH ITS BASE, A HEAT SENSITIVE EXPLOSIVE CHARGE DISPOSED IN SAID BORE AND IN CONTACT WITH SAID MAIN CHARGE, AN INSULATING DISK IN THE BOTTOM OF SAID CHARGE HOLDER, SAID DISK HAVING A BORE THERETHROUGH IN AXIAL ALIGNMENT WITH THE BORE IN SAID HOLDER, A RESISTANCE HEATING ELEMENT SPANNING THE BORE IN SAID DISK, AND IN CONTACT WITH SAID HEAT SENSITIVE EXPLOSIVE CHARGE, SAID ELEMENT COMPRISING A FLAT STRIP OF CONDUCTIVE METAL,
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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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |