US4165480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prospecting system using rotating superconducting electromagnetic dipole
Assignee: University of California, San Diego
•
Filing: 1977-12-12
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Granted: 1979-08-21
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Expires: 1997-12-12
Abstract
Abstract A prospecting system uses a rotating superconducting electromagnetic source which is swept over a frequency range with a magnetometer type receiver sensing the induced field. The effective dipole is rotated in a horizontal plane parallel to the ground surface with the sensed induced magnetic field being in the vertical axis.
Inventors
- 👤 H. Frank Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:30
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/035; G01V; G01V3/00; G01V3/08; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/845; Y10S505/846
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A prospecting system comprising: a direct current superconducting electromagnet for producing a dipole field; means for positioning such electromagnet close to a ground surface and continuously rotating said electromagnet and its resultant dipole around a predetermined axis; sensing means spaced from said electromagnet and close to said ground surface for measuring a predetermined component of the field in said ground induced by said rotating electromagnet.
Claim 2
Dependent Claim
65 words
A prospecting system comprising: a direct current superconducting electromagnet for producing a dipole field; means for positioning such electromagnet close to a ground surface and continuously rotating said electromagnet and its resultant dipole around a predetermined axis; sensing means spaced from said electromagnet and close to said ground surface for measuring a predetermined component of the field in said ground induced by said rotating electromagnet.
Claim 3
Dependent Claim
23 words
A system as in claim 1 where said means for rotating includes means for varying the speed of rotation over a predetermined range.
Claim 4
Dependent Claim
26 words
A system as in claim 1 where said axis of rotation is perpendicular to said ground surface whereby said dipole is rotated in a horizontal plane.
Claim 5
Dependent Claim
13 words
A system as in claim 3 where said sensed field component is vertical.
Claim 6
Dependent Claim
31 words
A system as in claim 1 where said spacing of said sensing means from said electromagnet is the same order of magnitude as the depth below the ground surface being prospected.
Claim 7
Dependent Claim
18 words
A system as in claim 1 where said means for positioning and rotating said electromagnet is substantially nonmetallic.
References Cited (Backward Citations)
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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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |