US3190378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for simultaneously drilling and casing a well hole
Assignee: Individual
•
Filing: 1962-09-18
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Granted: 1965-06-22
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Expires: 1982-09-18
Abstract
No abstract record available.
Inventors
- 👤 Sr Paul H Davey
- 👤 Jr Paul H Davey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:50
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN COMBINATION, A LENGTH OF WELL CASING, A HOLLOW SHOE CONCENTRIC WITH AND ROTATABLY MOUNTED ON THE LOWER END OF SAID CASING, THE SHOE HAVING CUTTING MEANS FOR DRILLING DOWNWARDLY, A DRILL ROD LOCATED CENTRALLY OF THE CASING HAVING A DRILL BIT AT ITS LOWER END, INWARDLY PROJECTING MEANS RIGID WITH THE SHOE, AND OUTWARDLY DIRECTED PULL-DOWN MEMBERS ON SAID DRILL ROD HAVING HORIZONTAL PORTIONS EFFECTIVE TO ENGAGE ABOVE SAID PROJECTING MEANS WHEN THE DRILL BIT IS A PREDETERMINED DISTANCE BELOW THE SHOE AND TO PULL SAID SHOE AND SAID CASING DOWNWARDLY AFTER THE BIT, SAID PULL-DOWN MEMBERS ALSO HAVING VERTICAL PORTIONS EFFECTIVE TO ENGAGE THE PROJECTING MEANS SO THAT A ROTATION OF THE DRILL ROD CAUSES ROTATION OF THE SHOE IN A DIRECTION EFFECTIVE TO OPERATE THE CUTTING MEANS.
Claim 2
Dependent Claim
130 words
IN COMBINATION, A LENGTH OF WELL CASING, A HOLLOW SHOE CONCENTRIC WITH AND ROTATABLY MOUNTED ON THE LOWER END OF SAID CASING, THE SHOE HAVING CUTTING MEANS FOR DRILLING DOWNWARDLY, A DRILL ROD LOCATED CENTRALLY OF THE CASING HAVING A DRILL BIT AT ITS LOWER END, INWARDLY PROJECTING MEANS RIGID WITH THE SHOE, AND OUTWARDLY DIRECTED PULL-DOWN MEMBERS ON SAID DRILL ROD HAVING HORIZONTAL PORTIONS EFFECTIVE TO ENGAGE ABOVE SAID PROJECTING MEANS WHEN THE DRILL BIT IS A PREDETERMINED DISTANCE BELOW THE SHOE AND TO PULL SAID SHOE AND SAID CASING DOWNWARDLY AFTER THE BIT, SAID PULL-DOWN MEMBERS ALSO HAVING VERTICAL PORTIONS EFFECTIVE TO ENGAGE THE PROJECTING MEANS SO THAT A ROTATION OF THE DRILL ROD CAUSES ROTATION OF THE SHOE IN A DIRECTION EFFECTIVE TO OPERATE THE CUTTING MEANS.
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |