US3587756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geodynamic wing
Assignee: American Gas Association Inc
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Filing: 1968-11-05
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Granted: 1971-06-28
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Expires: 1988-11-05
Abstract
Abstract APPARATUS FOR EXERCISING DIRECTIONAL CONTROL OVER HORIZONTRAL EARTH-BORING MACHINERY WHEREIN OPPOSITELY DISPOSED CONTROL VANES, SUCH VANES BEING PIVOTABLY MOUNTED ON THE EXTERIOR OF THE FORWARD SECTION OF THE CASING WHICH IS JACED INTO THE BORE AS IT IS EXTENDED, ARE DEFLECTED IN PAIRS. DEFLECTION OF THE VANES IN ACCOMPLISHED BY WRAPAROUND HYDRAULIC CYLINDERS AND THE VANES FUNCTION FIRST AS WEDGES AND THEREAFTER, AS THE CASING AND BORING TOOL MOVE FORWARD, AS CONTROL SURFACES TO GUIDE THE MACHINERY BACK ONTO THE DESIRED STRAIGHT-LINE PATH.
Inventors
- 👤 David E Adkins
- 👤 Ronald L Legue
- 👤 Michael V Widman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04
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 |