Patent US2761385A successfully refreshed from Google Patents.
US2761385A
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Devices for controlling the firing of charges of powder or explosives from a distance
Assignee: Services Petroliers Schlumberger SA
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Filing: 1951-10-24
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Granted: 1956-09-04
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Expires: 1971-10-24
Abstract
No abstract record available.
Inventors
- 👤 Marcel Schlumberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:42
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/1185; F; F42; F42D; F42D1/00; F42D1/04; F42D1/045; F42D1/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN APPARATUS FOR FIRING A PLURALITY OF EXPLOSIVE CHARGES FROM A DISTANCE, THE COMBINATION OF AT LEAST TWO ELECTRICAL IGNITER MEANS FOR SAID CHARGES, MEANS FOR SHORT-CIRCUITING ONE OF SAID IGNITER MEANS, A FIRING CIRCUIT INCLUDING THE OTHER OF SAID IGNITER MEANS, AND MEANS RESPONSIVE TO IGNITION OF SAID LAST-NAMED IGNITER MEANS FOR RENDERING SAID SHORT- CIRCUITING MEANS INEFFECTIVE.
Claim 2
Dependent Claim
59 words
IN APPARATUS FOR FIRING A PLURALITY OF EXPLOSIVE CHARGES FROM A DISTANCE, THE COMBINATION OF AT LEAST TWO ELECTRICAL IGNITER MEANS FOR SAID CHARGES, MEANS FOR SHORT-CIRCUITING ONE OF SAID IGNITER MEANS, A FIRING CIRCUIT INCLUDING THE OTHER OF SAID IGNITER MEANS, AND MEANS RESPONSIVE TO IGNITION OF SAID LAST-NAMED IGNITER MEANS FOR RENDERING SAID SHORT- CIRCUITING MEANS INEFFECTIVE.
References Cited (Backward Citations)
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US2343087A
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US2331058A
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US2511408A
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US2546686A
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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) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |