US3089724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic junk sub
Assignee: Sentinel Oil Tool Dev & Servic
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Filing: 1960-12-05
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Granted: 1963-05-14
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Expires: 1980-12-05
Abstract
No abstract record available.
Inventors
- 👤 George C Crooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A MAGNETIC JUNK SUB ADAPTED TO BE SECURED IN SERIES WITH A DRILL STEM STRING, COMPRISING IN COMBINATION, A NON-MAGNETIC LONGITUDINALLY EXTENDING TUBE, A SHOULDERED PORTION AROUND SAID TUBE ADJACENT ONE END THEREOF, MEANS ON EACH END OF SAID TUBE ADAPTED TO RECEIVE COUPLERS OF ADJACENT ELEMENTS OF SAID DRILL STEM STRING, AND A MAGNETIC ASSEMBLY FRICTIONALLY MOUNTED AROUND SAID TUBE BETWEEN SAID COUPLER AND SAID SHOULDER, SAID MAGNETIC ASSEMBLY INCLUDING A PAIR OF SPACED APART CYLINDRICAL END PIECES SURROUNDING SAID TUBE, ONE END OF ONE OF SAID CYLINDRICAL END PIECES REGISTERING AGAINST SAID SHOULDERED PORTION, ONE END OF THE OTHER OF SAID CYLINDRICAL END PIECES BEING ENGAGED BY THE ADJACENT END OF ONE OF SAID RECEIVED ADJACENT DRILL STRING COUPLERS, SAID MAGNETIC ASSEMBLY ALSO INCLUDING AT LEAST TWO SETS OF ARCUATELY CURVED MAGNETIC ELEMENTS MOUNTED AROUND SAID TUBE AND BETWEEN SAID CYLINDRICAL END PIECES, A PAIR OF CYLINDRICAL SLEEVES SURROUNDING SAID MAGNETIC ELEMENTS AND ENGAGING BY ONE END OF EACH THEREOF, SAID CYLINDRICAL END PIECES, SAID MAGNETIC ASSEMBLY ALSO INCLUDING A CENTRALLY LOCATED MAGNETIC SEPARATOR AROUND SAID TUBE AND BETWEEN SAID SETS OF MAGNETIC ELEMENTS, THE OTHER ENDS OF SAID CYLINDRICAL TUBES ENGAGING SAID SEPARATOR.
Claim 2
Dependent Claim
196 words
A MAGNETIC JUNK SUB ADAPTED TO BE SECURED IN SERIES WITH A DRILL STEM STRING, COMPRISING IN COMBINATION, A NON-MAGNETIC LONGITUDINALLY EXTENDING TUBE, A SHOULDERED PORTION AROUND SAID TUBE ADJACENT ONE END THEREOF, MEANS ON EACH END OF SAID TUBE ADAPTED TO RECEIVE COUPLERS OF ADJACENT ELEMENTS OF SAID DRILL STEM STRING, AND A MAGNETIC ASSEMBLY FRICTIONALLY MOUNTED AROUND SAID TUBE BETWEEN SAID COUPLER AND SAID SHOULDER, SAID MAGNETIC ASSEMBLY INCLUDING A PAIR OF SPACED APART CYLINDRICAL END PIECES SURROUNDING SAID TUBE, ONE END OF ONE OF SAID CYLINDRICAL END PIECES REGISTERING AGAINST SAID SHOULDERED PORTION, ONE END OF THE OTHER OF SAID CYLINDRICAL END PIECES BEING ENGAGED BY THE ADJACENT END OF ONE OF SAID RECEIVED ADJACENT DRILL STRING COUPLERS, SAID MAGNETIC ASSEMBLY ALSO INCLUDING AT LEAST TWO SETS OF ARCUATELY CURVED MAGNETIC ELEMENTS MOUNTED AROUND SAID TUBE AND BETWEEN SAID CYLINDRICAL END PIECES, A PAIR OF CYLINDRICAL SLEEVES SURROUNDING SAID MAGNETIC ELEMENTS AND ENGAGING BY ONE END OF EACH THEREOF, SAID CYLINDRICAL END PIECES, SAID MAGNETIC ASSEMBLY ALSO INCLUDING A CENTRALLY LOCATED MAGNETIC SEPARATOR AROUND SAID TUBE AND BETWEEN SAID SETS OF MAGNETIC ELEMENTS, THE OTHER ENDS OF SAID CYLINDRICAL TUBES ENGAGING SAID SEPARATOR.
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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |