US3299971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core drill
Assignee: Ingersoll Rand Co
•
Filing: 1964-08-06
•
Granted: 1967-01-24
•
Expires: 1984-08-06
Abstract
No abstract record available.
Inventors
- 👤 Samuel P Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
E; E21; E21B; E21B25/00; E21B4/00; E21B4/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A CORE DRILL COMPRISING: AN ELONGATED CASING; A DRILL BIT MOUNTED WITHIN ONE END OF SAID CASING FOR ROTATION WITH SAID CASING AND LIMITED AXIAL MOVEMENT RELATIVE TO SAID CASING; SAID CASING BEING DIMENSIONED TO FOLLOW SAID DRILL BIT DOWN A HOLE BEING DRILLED; TUBULAR MEANS MOUNTED WITHIN SAID CASING TO PROVIDE A CONTINUOUSLY UNOBSTRUCTED PASSAGE BETWEEN THE DRILL BIT AND THE TOP OF SAID CASING AND DIMENSIONED TO BE SPACED FROM SAID CASING TO DEFINE AN ANNULAR SPACE; PISTON MEANS MOUNTED FOR AXIAL MOVEMENT WITHIN SAID ANNULAR SPACE; PASSAGE MEANS FOR DELIVERING PRESSURIZED FLUID TO SAID PISTON MEANS; AND ANNULAR VALVE MEANS DISPOSED WITHIN SAID ANNULAR SPACE FOR CONTROLLING THE FLOW OF PRESSURIZED FLUID TO OPPOSITE SIDES OF SAID PISTON MEANS TO CAUSE SAID PISTON MEANS TO DELIVER AN IMPACT TO SAID DRILL BIT.
Claim 2
Dependent Claim
135 words
A CORE DRILL COMPRISING: AN ELONGATED CASING; A DRILL BIT MOUNTED WITHIN ONE END OF SAID CASING FOR ROTATION WITH SAID CASING AND LIMITED AXIAL MOVEMENT RELATIVE TO SAID CASING; SAID CASING BEING DIMENSIONED TO FOLLOW SAID DRILL BIT DOWN A HOLE BEING DRILLED; TUBULAR MEANS MOUNTED WITHIN SAID CASING TO PROVIDE A CONTINUOUSLY UNOBSTRUCTED PASSAGE BETWEEN THE DRILL BIT AND THE TOP OF SAID CASING AND DIMENSIONED TO BE SPACED FROM SAID CASING TO DEFINE AN ANNULAR SPACE; PISTON MEANS MOUNTED FOR AXIAL MOVEMENT WITHIN SAID ANNULAR SPACE; PASSAGE MEANS FOR DELIVERING PRESSURIZED FLUID TO SAID PISTON MEANS; AND ANNULAR VALVE MEANS DISPOSED WITHIN SAID ANNULAR SPACE FOR CONTROLLING THE FLOW OF PRESSURIZED FLUID TO OPPOSITE SIDES OF SAID PISTON MEANS TO CAUSE SAID PISTON MEANS TO DELIVER AN IMPACT TO SAID DRILL BIT.
References Cited (Backward Citations)
US1087632A
Cited
US1897121A
Cited
US2345739A
Cited
US2915284A
Cited
US3162251A
Cited
US3051134A
Cited
US3084673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |