US4307780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angular whipstock alignment means
Assignee: Baker International Corp
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Filing: 1980-07-21
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Granted: 1981-12-29
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Expires: 2000-07-21
Abstract
Abstract A compass card is provided for use in achieving the angular alignment of a whipstock relative to a whipstock anchor having a keyway therein for subsequent insertion in a packer apparatus for use in a subterranean well. The compass card comprises an annular card having polar coordinates in mirror image reverse relationship on one face thereof and may have a plurality of sheet-like magnetic elements secured to the other face adjacent a central opening therein.
Inventors
- 👤 Alfred R. Curington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:41
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/024; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A compass card for use in achieving the angular alignment of a whipstock relative to a whipstock anchor shaft having a keyway therein for subsequent insertion in a packer for a subterranean well, comprising an annular card having a circular opening constructed and arranged to slidably fit on the whipstock anchor shaft and be angularly adjustable about the shaft axis, said card having polar coordinates in image reversed relationship on one face thereof.
Claim 2
Dependent Claim
73 words
A compass card for use in achieving the angular alignment of a whipstock relative to a whipstock anchor shaft having a keyway therein for subsequent insertion in a packer for a subterranean well, comprising an annular card having a circular opening constructed and arranged to slidably fit on the whipstock anchor shaft and be angularly adjustable about the shaft axis, said card having polar coordinates in image reversed relationship on one face thereof.
Claim 3
Dependent Claim
29 words
A compass card as defined in claim 1 further comprising a plurality of sheet-like magnetic elements secured to the other face of the card adjacent the central opening therein.
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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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |