US3907045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guidance system for a horizontal drilling apparatus
Assignee: C0NSOLIDATION COAL Co
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Filing: 1973-11-30
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Granted: 1975-09-23
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Expires: 1993-11-30
Abstract
Abstract An apparatus for boring an elongated borehole with a drilling apparatus which contains a flux sensitive coil and directional drilling control apparatus. An antenna is inserted through a borehole which has already been drilled and is connected between ground and a signal generating apparatus. Flux generated by the antenna will be picked up by the flux sensitive coil. A readout apparatus is connected to the coil, and an indication of the magnitude of the flux being cut by the coil is determined. A control system coupled to the horizontal drill is then actuated to maintain the horizontal drill along a predetermined path which is substantially parallel to the borehole previously drilled.
Inventors
- 👤 Herbert Douglas Dahl
- 👤 Tibor O Edmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:14
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046; E21B47/00; E21B47/02; E21B47/022; E21B47/0228; E21B47/0232; E21B47/12; E21B47/13; E21B7/06; E21B7/068
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
In an apparatus for boring an elongated generally horizontal borehole where the drilling apparatus contains a directional drilling control apparatus, a means for maintaining a second borehole being bore parallel to a first borehole already bored, comprising: a flux-sensitive coil having its axis oriented normal to said apparatus for boring; a signal generating means having a pair of terminals; antenna means disposed insulatively along the length of said first borehole, having one end grounded and the remaining end connected to one of said terminals with said remaining signal generating means terminal being connected to ground; means connecting said flux-sensitive coil to a readout means which indicates maximum voltage response; and means coupled to said directional drilling control apparatus for directionally controlling said drilling apparatus responsive to said measured flux magnitude from said readout apparatus to maintain maximum response.
Claim 2
Dependent Claim
138 words
In an apparatus for boring an elongated generally horizontal borehole where the drilling apparatus contains a directional drilling control apparatus, a means for maintaining a second borehole being bore parallel to a first borehole already bored, comprising: a flux-sensitive coil having its axis oriented normal to said apparatus for boring; a signal generating means having a pair of terminals; antenna means disposed insulatively along the length of said first borehole, having one end grounded and the remaining end connected to one of said terminals with said remaining signal generating means terminal being connected to ground; means connecting said flux-sensitive coil to a readout means which indicates maximum voltage response; and means coupled to said directional drilling control apparatus for directionally controlling said drilling apparatus responsive to said measured flux magnitude from said readout apparatus to maintain maximum response.
Claim 3
Dependent Claim
17 words
An apparatus as defined in claim 1 wherein said antenna means comprises a single insulated long wire.
References Cited (Backward Citations)
US3285350A
Cited
US3406766A
Cited
US3578807A
Cited
US3529682A
Cited
US3589454A
Cited
US3746106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |