US3262501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for pulling a well liner
Assignee: MIDWAY FISHING TOOL Co
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Filing: 1965-09-23
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Granted: 1966-07-26
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Expires: 1985-09-23
Abstract
No abstract record available.
Inventors
- 👤 Sam L Winger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:11
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN AN APPARATUS FOR WITHDRAWING A LINER FROM AN OIL WELL, THE COMBINATION OF: A ROTARY VALVE HAVING MEANS FOR SECURING THE SAME ON THE LOWER END OF A DRILL STRING AND OPERABLE BY ROTATION OF SAID STRING BETWEEN OPEN AND CLOSED POSITIONS, SAID VALVE IN OPEN POSITION PROVIDING FREE COMMUNICATION BETWEEN THE INTERIOR OF SAID DRILL STRING AND THE EXTERIOR THEREOF AND IN ITS CLOSED POSITION SHUTTING OFF SUCH COMMUNICATION; AN ANNULAR RUBBER PACKER SLIDABLY FITTING THE INSIDE OF THE WELL CASING AND ASSEMBLED ON THE LOWER END OF SAID VALVE; AND A SPEAR ASSEMBLED ON THE LOWER END OF SAID PACKER, THERE BEING A CENTRAL BORE EXTENDING THROUGH SAID TOOL AND COMMUNICATING WITH THE BORE OF SAID DRILL STRING AND THE LOWER END OF SAID SPEAR, SAID SPEAR BEING OPERABLE BY MANIPULATION OF SAID DRILL STRING TO OPTIONALLY SET SAID SPEAR IN INTERNAL GRIPPING RELATION WITH A LINER OR, AFTER HAVING BEEN SO SET TO DISENGAGE SAID LINER.
Claim 2
Dependent Claim
160 words
IN AN APPARATUS FOR WITHDRAWING A LINER FROM AN OIL WELL, THE COMBINATION OF: A ROTARY VALVE HAVING MEANS FOR SECURING THE SAME ON THE LOWER END OF A DRILL STRING AND OPERABLE BY ROTATION OF SAID STRING BETWEEN OPEN AND CLOSED POSITIONS, SAID VALVE IN OPEN POSITION PROVIDING FREE COMMUNICATION BETWEEN THE INTERIOR OF SAID DRILL STRING AND THE EXTERIOR THEREOF AND IN ITS CLOSED POSITION SHUTTING OFF SUCH COMMUNICATION; AN ANNULAR RUBBER PACKER SLIDABLY FITTING THE INSIDE OF THE WELL CASING AND ASSEMBLED ON THE LOWER END OF SAID VALVE; AND A SPEAR ASSEMBLED ON THE LOWER END OF SAID PACKER, THERE BEING A CENTRAL BORE EXTENDING THROUGH SAID TOOL AND COMMUNICATING WITH THE BORE OF SAID DRILL STRING AND THE LOWER END OF SAID SPEAR, SAID SPEAR BEING OPERABLE BY MANIPULATION OF SAID DRILL STRING TO OPTIONALLY SET SAID SPEAR IN INTERNAL GRIPPING RELATION WITH A LINER OR, AFTER HAVING BEEN SO SET TO DISENGAGE SAID LINER.
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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |