Patent US3208539A successfully refreshed from Google Patents.
US3208539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drilling wells
Assignee: Walker Neer Manufacturing Co Inc
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Filing: 1958-09-17
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Granted: 1965-09-28
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Expires: 1978-09-17
Abstract
No abstract record available.
Inventors
- 👤 Homer I Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:55
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A DRILL PIPE STAND COMPRISING: AN OUTER PIPE AND A SMALLER DIAMETER INNER PIPE WITHIN SAID OUTER PIPE, SAID INNER PIPE FORMING AN INNER FLOW PASSAGE, SAID INNER AND OUTER PIPES FOMRING RADIALLY THEREBETWEEN AN OUTER FLOW PASSAGE ISOLATED FROM SAID INNER PASSAGE, SAID OUTER PIPE HAVING END PORTIONS ADAPTED FOR THREADED INTERENGAGEMENT WITH THE END PORTIONS OF THE OUTER PIPES OF SUCCESSIVE STANDS TO FORM A JOINT BETWEEN SAID OUTER PIPES AND TO SECURE SUCCESSIVE STANDS TOGETHER, SAID INNER PIPE HAVING END PORTIONS FORMED TO ENGAGE TELESCOPICALLY WITH THE ADJACENT END PORTIONS OF INNER PIPES OF SUCCESSIVE STANDS, SAID INNER PIPE END PORTIONS BEING LOCATED RELATIVE TO SAID OUTER PIPE END PORTIONS SO THAT IN THE FULLY MADEUP CONDITION OF SAID OUTER PIPE JOINTS THE INNER PIPE END PORTIONS ARE FREE OF AXIALLY INTENGAGEABLE STOP SURFACES WHICH WOULD PREVENT A LIMITED RANGE OF RELATIVE AXIAL MOVEMENT BETWEEN SAID ADJACENT INNER PIPE END PORTIONS, MEANS ON AT LEAST ONE OF SAID INNER PIPE END PORTIONS ADAPTED TO FORM A SEAL PREVENTING FLUID LEAKAGE BE-
Claim 2
Dependent Claim
174 words
A DRILL PIPE STAND COMPRISING: AN OUTER PIPE AND A SMALLER DIAMETER INNER PIPE WITHIN SAID OUTER PIPE, SAID INNER PIPE FORMING AN INNER FLOW PASSAGE, SAID INNER AND OUTER PIPES FOMRING RADIALLY THEREBETWEEN AN OUTER FLOW PASSAGE ISOLATED FROM SAID INNER PASSAGE, SAID OUTER PIPE HAVING END PORTIONS ADAPTED FOR THREADED INTERENGAGEMENT WITH THE END PORTIONS OF THE OUTER PIPES OF SUCCESSIVE STANDS TO FORM A JOINT BETWEEN SAID OUTER PIPES AND TO SECURE SUCCESSIVE STANDS TOGETHER, SAID INNER PIPE HAVING END PORTIONS FORMED TO ENGAGE TELESCOPICALLY WITH THE ADJACENT END PORTIONS OF INNER PIPES OF SUCCESSIVE STANDS, SAID INNER PIPE END PORTIONS BEING LOCATED RELATIVE TO SAID OUTER PIPE END PORTIONS SO THAT IN THE FULLY MADEUP CONDITION OF SAID OUTER PIPE JOINTS THE INNER PIPE END PORTIONS ARE FREE OF AXIALLY INTENGAGEABLE STOP SURFACES WHICH WOULD PREVENT A LIMITED RANGE OF RELATIVE AXIAL MOVEMENT BETWEEN SAID ADJACENT INNER PIPE END PORTIONS, MEANS ON AT LEAST ONE OF SAID INNER PIPE END PORTIONS ADAPTED TO FORM A SEAL PREVENTING FLUID LEAKAGE BE-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |