US3367430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination drill and reamer bit
Assignee: Norton Christensen Inc
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Filing: 1966-08-24
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Granted: 1968-02-06
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Expires: 1986-08-24
Abstract
No abstract record available.
Inventors
- 👤 David S Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/26; E21B10/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
229 words
IN A ROTARY BIT FOR DRILLING A WELL BORE HOLE; A BODY STRUCTURE INCLUDING A LOWER PILOT PORTION AND A REAMER PORTION ABOVE SAID PILOT PORTION; SAID PILOT PORTION INCLUDING A LOWER END DRILLING FACE HAVING CUTTING ELEMENTS THEREON FOR DRILLING ON THE BOTTOM OF THE BORE HOLE AND A FRIST ELONGATE REAMING FACE SUBSTANTIALLY PARALLEL TO THE BODY STRUCTURE AXIS AND HAVING CUTTING ELEMENTS THEREON; SAID REAMER PORTION HAVING A SECOND REAMING FACE SUBSTANTIALLY PARALLEL TO THE BODY STRUCTURE AXIS AND EXTENDING ARCUATELY AROUND THE REAMER PORTION SUBSTANTIALLY LESS THAN 180 DEGREES, SAID SECOND REAMING FACE HAVING CUTTING ELEMENTS THEREON AND HAVING A RADIUS SUBSTANTIALLY GREATER THAN THE RADIUS OF SAID FIRST REAMING FACE; SAID REAMER PORTION HAVING A NON-REAMING FACE OPPOSITE SAID SECOND REAMING FACE AND EXTENDING ARCUATELY SUBSTANTIALLY MORE THAN 180 DEGREES AROUND SAID REAMER PORTION FROM AND BETWEEN THE OPPOSITE ENDS OF SAID SECOND REAMING FACE; SAID NON-REAMING FACE HAVING A RADIUS SUBSTANTIALLY LESS THAN THE RADIUS OF SAID SECOND REAMING FACE; SAID FIRST REAMING FACE BEING DISPOSED AT LEAST DIAMETRICALLY OPPOSITE THE MID-PORTION OF SAID SECOND REAMING FACE; SAID REAMER PORTION HAVING A THIRD REAMING FACE EXTENDING BETWEEN SAID FIRST REAMING FACE AND SECOND REAMING FACE AND INCLIND UPWARDLY AND OUTWARDLY FROM SAID FIRST REAMING FACE TO SAID SECOND REAMING FACE AT A SHALLOW ANGLE TO THE BODY STRUCTURE AXIS; SAID THIRD REAMING FACE
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) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |