US3306378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collar
Assignee: Individual
•
Filing: 1965-03-16
•
Granted: 1967-02-28
•
Expires: 1985-03-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward B Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:13
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A ROTARY DRILLING STRING COMPRISING A DRILL PIPE AND A DRILL BIT ROTATED BY THE DRILL PIPE FOR DRILLING A BORE HOLE, DRILL COLLARS CONNECTING THE DRILL BIT TO THE DRILL PIPE TO MAINTAIN A STIFF STEM ABOVE THE DRILL BIT FOR MINIMIZING DEVIATION OF THE DRILL BIT CAUSED BY CORKSCREWING OF THE DRILL PIPE UNDER LOAD, SAID DRILL COLLARS EACH INCLUDING AN ELONGATED BODY OF LESS CROSS SECTION THAN THE BORE HOLE MADE BY THE DRILL BIT, AND MEANS CONNECTING THE DRILL COLLARS IN END TO END RELATION WITH MAJOR PORTIONS OF THE DRILL COLLARS OFFSET OUTWARDLY FROM THE AXIS OF ROTATION AND WITH SAID MAJOR PORTION OF ONE DRILL COLLAR SPACED CIRCUMFERENTIALLY IN SYMMETRY WITH SAID MAJOR PORTION OF THE OTHER TO GYRATE IN CONTACT WITH THE WALL OF THE BORE HOLE.
Claim 2
Dependent Claim
135 words
IN A ROTARY DRILLING STRING COMPRISING A DRILL PIPE AND A DRILL BIT ROTATED BY THE DRILL PIPE FOR DRILLING A BORE HOLE, DRILL COLLARS CONNECTING THE DRILL BIT TO THE DRILL PIPE TO MAINTAIN A STIFF STEM ABOVE THE DRILL BIT FOR MINIMIZING DEVIATION OF THE DRILL BIT CAUSED BY CORKSCREWING OF THE DRILL PIPE UNDER LOAD, SAID DRILL COLLARS EACH INCLUDING AN ELONGATED BODY OF LESS CROSS SECTION THAN THE BORE HOLE MADE BY THE DRILL BIT, AND MEANS CONNECTING THE DRILL COLLARS IN END TO END RELATION WITH MAJOR PORTIONS OF THE DRILL COLLARS OFFSET OUTWARDLY FROM THE AXIS OF ROTATION AND WITH SAID MAJOR PORTION OF ONE DRILL COLLAR SPACED CIRCUMFERENTIALLY IN SYMMETRY WITH SAID MAJOR PORTION OF THE OTHER TO GYRATE IN CONTACT WITH THE WALL OF THE BORE HOLE.
References Cited (Backward Citations)
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Cited
US1954166A
Cited
US2164348A
Cited
US2173309A
Cited
US2745635A
Cited
US2712434A
Cited
US2841366A
Cited
US2891769A
Cited
US3180439A
Cited
US3237705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |