Patent US3175492A successfully refreshed from Google Patents.
US3175492A
Expired / Lapsed
US
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Electrical safety detonator
Assignee: Services Petroliers Schlumberger SA
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Filing: 1962-06-04
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Granted: 1965-03-30
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Expires: 1982-06-04
Abstract
No abstract record available.
Inventors
- 👤 Reyne Maurice
- 👤 Charrin Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:43
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/11; F42B3/12; F42B3/124; F42B3/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
AN INITER FOR A BLASTING CAP INCLUDING AN ENCLOSURE MEMBER FOR RECEIPT WITHIN A BLASTING CAP CONTAINER, AN IGNITING COMPOSITION DISPOSED IN SAID ENCLOSURE MEMBER, SAID IGNITING OCMPOSITION BEING STABLE UP TO A TEMPERATURE SUBSTANTIALLY NOT LESS THAN 600*C., AN ELECTRICAL RESISTOR DISPOSED WITHIN SID IGNITING COMPOSITION, AN ELECTRICAL CONDUCTOR MEANS ATTACHED TO SAID RESISTOR FOR CONDUCTING CURRENT THROUGH SAID RESISTOR, THE RESISTANCE OF SAID RESISTOR BEING IN THE RANGE OF 15-80 OHMS AND CAPABLE OF BEING HEATED TO TEMPERATURES IN EXCESS OF 600*C. IN APPROXIMATELY ONE SECOND IN RESPONSE TO A SUBSTAINED APPLICATION OF ELECTRICAL CURRENT, EYT BEING INSENSITIVE TO STRAY ELECTRICAL CURRENTS.
References Cited (Backward Citations)
US991373A
Cited
US1617675A
Cited
US2240438A
Cited
US3040660A
Cited
US2882820A
Cited
US2926566A
Cited
US2953443A
Cited
US3059576A
Cited
US2987997A
Cited
US3054351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |