Patent US3587740A successfully refreshed from Google Patents.
US3587740A
Expired / Lapsed
US
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Apparatus for use in deviated wells
Assignee: Layne and Bowler Co
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Filing: 1969-03-10
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Granted: 1971-06-28
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Expires: 1989-03-10
Abstract
Abstract A WELL SCREEN IS DISPOSED ON A STRING OF PRODUCTION CONDUIT ON A LENGTH OF CONDUIT AT LEAST ONE END OF WHICH IS JOINED TO ADJACENT CONDUIT LENGTHS BY A BALL JOINT CONNECTION. THE BALL JOINT CONNECTION HAS A MAXIMUM OUTSIDE DIAMETER SIGNIFICANTLY SMALLER THAN THE DIAMETER OF THE BOREHOLE WALL, AND A MINIMUM INSIDE DIAMETER SUFFICIENT FOR MAINTAINING AN UNOBSTRUCTED CENTRAL PASSAGEWAY THROUGH THE CONNECTION. CENTRALIZER SPRINGS ARE POSITIONED AROUND THE BALL JOINT CONNECTION.
Inventors
- 👤 Fred W Gerwick
- 👤 Harold C Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:36
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B17/00; E21B17/02; E21B17/04; E21B17/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |