Patent US3215074A successfully refreshed from Google Patents.
US3215074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for well drilling operations with explosives
Assignee: ExxonMobil Upstream Research Co
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Filing: 1963-06-13
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Granted: 1965-11-02
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Expires: 1983-06-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Leon H Robinson
- 👤 Robert H Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
AN EXPLOSIVE ASSEMBLY FOR WELL DRILLING OPERATIONS COMPRISING: AN ELONGATED HOUSING TERMINATING IN AN OGIVE AT ONE END THEREOF; A FIRST SHAPED EXPLOSIVE CHARGE SUPPORTED IN THE OTHER END OF SAID HOUSING, HAVING A CONICAL OPENING FACING TOWARD SAID OGIVE, THE AXIS OF SAID CONICAL OPENING BEING DIRECTED SUBSTANTIALLY AT THE POINT OF SAID OGIVE; AT LEAST ONE ADDITIONAL SHAPED EXPLOSIVE CHARGE SUPPORTED IN SAID HOUSING BETWEEN SAID FIRST SHAPED CHARGE AND SAID OGIVE, EACH SAID AT LEAST ONE ADDITIONAL SHAPED CHARGE HAVING AN OPENING THERETHROUGH, AT LEAST A PORTION OF WHICH IS FRUSTO-CONICAL, THE AXIS OF SAID FRUSTO-CONICAL PORTION BEING SUBSTANTIALLY COLINEAR WITH THE AXIS OF THE CONICAL OPENING OF SAID ONE SHAPED CHARGE; A SYNDETIC EXPLOSIVE CHARGE INTERCONNECTING EACH ADJACENT PAIR OF SAID SHAPED CHARGES, THE BURNING TIME OF SAID SYNDETIC CHARGE BEING AT LEAST EQUAL TO THE TIME REQUIRED FOR SUBSTANTIALLY THE ENTIRETY OF THE EXPLOSIVE JET PRODUCED BY ONE OF SAID EACH ADJACENT PAIR OF SHAPED CHARGES TO PASS INTO THE OPENING THROUGH THE OTHER OF SAID EACH ADJACENT PAIR OF SHAPED CHARGES; THE CONE ANGLE OF THE CONICAL AND FRUSTO-CONICAL OPENINGS OF SAID SHAPED CHARGES BEING SUBSTANTIALLY EQUAL; ANF
Claim 2
Dependent Claim
194 words
AN EXPLOSIVE ASSEMBLY FOR WELL DRILLING OPERATIONS COMPRISING: AN ELONGATED HOUSING TERMINATING IN AN OGIVE AT ONE END THEREOF; A FIRST SHAPED EXPLOSIVE CHARGE SUPPORTED IN THE OTHER END OF SAID HOUSING, HAVING A CONICAL OPENING FACING TOWARD SAID OGIVE, THE AXIS OF SAID CONICAL OPENING BEING DIRECTED SUBSTANTIALLY AT THE POINT OF SAID OGIVE; AT LEAST ONE ADDITIONAL SHAPED EXPLOSIVE CHARGE SUPPORTED IN SAID HOUSING BETWEEN SAID FIRST SHAPED CHARGE AND SAID OGIVE, EACH SAID AT LEAST ONE ADDITIONAL SHAPED CHARGE HAVING AN OPENING THERETHROUGH, AT LEAST A PORTION OF WHICH IS FRUSTO-CONICAL, THE AXIS OF SAID FRUSTO-CONICAL PORTION BEING SUBSTANTIALLY COLINEAR WITH THE AXIS OF THE CONICAL OPENING OF SAID ONE SHAPED CHARGE; A SYNDETIC EXPLOSIVE CHARGE INTERCONNECTING EACH ADJACENT PAIR OF SAID SHAPED CHARGES, THE BURNING TIME OF SAID SYNDETIC CHARGE BEING AT LEAST EQUAL TO THE TIME REQUIRED FOR SUBSTANTIALLY THE ENTIRETY OF THE EXPLOSIVE JET PRODUCED BY ONE OF SAID EACH ADJACENT PAIR OF SHAPED CHARGES TO PASS INTO THE OPENING THROUGH THE OTHER OF SAID EACH ADJACENT PAIR OF SHAPED CHARGES; THE CONE ANGLE OF THE CONICAL AND FRUSTO-CONICAL OPENINGS OF SAID SHAPED CHARGES BEING SUBSTANTIALLY EQUAL; ANF
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |