US3376938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable drilling mast having spaced swivel and traveling block guides
Assignee: Hycalog Inc
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Filing: 1966-05-23
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Granted: 1968-04-09
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Expires: 1986-05-23
Abstract
No abstract record available.
Inventors
- 👤 Paul J Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
E; E21; E21B; E21B15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
WELL APPARATUS COMPRISING A BASE, A MAST MEANS MOUNTING THE MAST ON SAID BASE FOR MOVEMENT OF THE MAST BETWEEN A FIRST AND A SECOND POSITION TO RESPECTIVELY ALIGN FIRST AND SECOND MAST AXES WITH THE CENTER LINE OF A BORE HOLE IN THE EARTH; A PIPE ELEVATOR ADAPTED TO ENGAGE A PIPE AND MOVE IT UP AND DOWN; A SWIVEL ADAPTED TO BE CONNECTED TO THE UPPER END OF A PIPE STRING TO SUPPORT THE SAME AND TO CONDUCT FLUID TO OR FROM THE PIPE STRING AS THE LATTER IS ROTATED; MEANS FOR MOVING THE ELE-
Claim 2
Dependent Claim
97 words
WELL APPARATUS COMPRISING A BASE, A MAST MEANS MOUNTING THE MAST ON SAID BASE FOR MOVEMENT OF THE MAST BETWEEN A FIRST AND A SECOND POSITION TO RESPECTIVELY ALIGN FIRST AND SECOND MAST AXES WITH THE CENTER LINE OF A BORE HOLE IN THE EARTH; A PIPE ELEVATOR ADAPTED TO ENGAGE A PIPE AND MOVE IT UP AND DOWN; A SWIVEL ADAPTED TO BE CONNECTED TO THE UPPER END OF A PIPE STRING TO SUPPORT THE SAME AND TO CONDUCT FLUID TO OR FROM THE PIPE STRING AS THE LATTER IS ROTATED; MEANS FOR MOVING THE ELE-
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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |