Patent US3938255A successfully refreshed from Google Patents.
US3938255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cantilever-type inclinometer
Assignee: MI Drilling Fluids Co
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Filing: 1974-03-07
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Granted: 1976-02-17
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Expires: 1994-03-07
Abstract
Abstract Apparatus for determining the inclination of a well bore comprising a flexible rod having an upper end rigidly supported by the apparatus and a needle point means operatively connected with the lower end of said rod and suspended over a vertically movable target. The target is responsive to a predetermined condition, such as time or location, for moving the target relatively towards and against the needle point whereby the needle point will perforate the target to indicate the inclination of the well bore. A weight means is mounted on the flexible rod above the needle point to cause a bending of the rod by cantilever action when the apparatus is in the well bore and when the well bore is inclined with respect to the vertical.
Inventors
- 👤 Henry P. Lichte, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:07
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/12; G01C9/14; E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; E21B47/0236
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
Apparatus for determining the inclination of a well bore comprising a flexible rod having an upper end and a lower end, means in said apparatus for rigidly supporting said upper end of said rod, a target means, means for vertically moving said target means needle point means operatively connected with said lower end of said rod and suspended over said vertically movable target means, means responsive to a predetermined condition for moving said target means relatively towards and against said needle point means, an elongated threaded cylinder mounted on said flexible rod above said needle point means, weight means having a threaded opening therein engaging the threads on said elongated threaded cylinder whereby said weight means can be rotated on said elongated threaded cylinder to move said weight means upwardly or downwardly, said weight means causing bending of said rod by cantilever action when said apparatus is in said well bore and said well bore is inclined with respect to the vertical, and a lock nut means mounted on said elongated threaded cylinder for locking against said weight means to hold said weight means in fixed vertical position on said elongated cylinder.
Claim 2
Dependent Claim
192 words
Apparatus for determining the inclination of a well bore comprising a flexible rod having an upper end and a lower end, means in said apparatus for rigidly supporting said upper end of said rod, a target means, means for vertically moving said target means needle point means operatively connected with said lower end of said rod and suspended over said vertically movable target means, means responsive to a predetermined condition for moving said target means relatively towards and against said needle point means, an elongated threaded cylinder mounted on said flexible rod above said needle point means, weight means having a threaded opening therein engaging the threads on said elongated threaded cylinder whereby said weight means can be rotated on said elongated threaded cylinder to move said weight means upwardly or downwardly, said weight means causing bending of said rod by cantilever action when said apparatus is in said well bore and said well bore is inclined with respect to the vertical, and a lock nut means mounted on said elongated threaded cylinder for locking against said weight means to hold said weight means in fixed vertical position on said elongated cylinder.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |