US3866111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of mineral exploration by detecting electromagnetic energy at power line frequency
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1973-07-18
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Granted: 1975-02-11
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Expires: 1993-07-18
Abstract
Abstract A method for exploring for subsurface electrically conductive bodies in which an existing electrical power transmission line is used as a source or transmitter of electromagnetic energy departed to the ground. The electromagnetic energy induced in the ground by the transmitted electromagnetic energy is measured at spaced apart, horizontally aligned stations in transverse, parallel and vertical directions relative to the line of stations and plotted against the station locations. The presence and location of a subsurface conductor body capable of producing measurable induced electromagnetic energy is determinable from resolution and shape of the plotted curves.
Inventors
- 👤 Roy K Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:03
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A method for exploring for a subterranean electrically conductive massive sulfide body in which induced electromagnetic energy is measured comprising the steps of: measuring induced electromagnetic energy at selected horizontally spaced apart, aligned station locations only at the frequency, or harmonic thereof, of electrical power current being transmitted over an electrical power line capable of inducing a measurable electromagnetic field in said conductive body, said measurements being made in three coordinate directions X and Y and Z, each coordinate direction being perpendicular to the other, said X and Y and Z directions being, respectively, transverse and parallel and vertical to said conductive body; and plotting said measurements against the station locations to produce an X curve and a Y curve and a Z curve to provide indications of the locations of said conductive body.
Claim 2
Independent Claim
134 words
A method for exploring for a subterranean electrically conductive massive sulfide body in which induced electromagnetic energy is measured comprising the steps of: measuring induced electromagnetic energy at selected horizontally spaced apart, aligned station locations only at the frequency, or harmonic thereof, of electrical power current being transmitted over an electrical power line capable of inducing a measurable electromagnetic field in said conductive body, said measurements being made in three coordinate directions X and Y and Z, each coordinate direction being perpendicular to the other, said X and Y and Z directions being, respectively, transverse and parallel and vertical to said conductive body; and plotting said measurements against the station locations to produce an X curve and a Y curve and a Z curve to provide indications of the locations of said conductive body.
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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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |