US3975676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural electrode system for determining the electrical parameters of large samples of materials in situ
Assignee: United States Department of the Air Force
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Filing: 1974-03-29
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Granted: 1976-08-17
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Expires: 1994-03-29
Abstract
Abstract A system and method for determining the electrical parameters of large samples of materials in situ. A set of linear electrodes in boreholes forms a square pattern; positive and negative electrical potentials on alternate electrodes create symmetry planes which define several "cells"; a given fraction of electrical current leaves an electrode and reaches a corresponding electrode, an impedance characteristic is determined for each cell. The presence of inhomogeneity and anisotropy is reflected by unequal currents in geometrically equivalent cells.
Inventors
- 👤 Emmanuel E. Bliamptis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A system for determining irregularities in large geophysical samples comprising: a frequency signal generator; a plurality of linear cylindrically shaped electrodes, adapted to be positioned within the sample and in electrical contact therewith, said electrodes each including a plurality of electrically independent segments, mechanically connected along a common longitudinal axis; a junction box means connecting the frequency signal generator and each said segment of each electrode, wherein a certain designated number of electrodes and segments receive a positive signal from said frequency signal generator and a certain designated number of electrodes and segments receive a negative signal from said frequency signal generator, and periodically varying voltages of different frequencies may be applied to each segment; a recording-display means and sampling resistors positioned in the circuit between said frequency signal generator and said electrodes and connected to the recording-display means whereby changes in current created by sample irregularities will be recorded and displayed.
Claim 2
Independent Claim
152 words
A system for determining irregularities in large geophysical samples comprising: a frequency signal generator; a plurality of linear cylindrically shaped electrodes, adapted to be positioned within the sample and in electrical contact therewith, said electrodes each including a plurality of electrically independent segments, mechanically connected along a common longitudinal axis; a junction box means connecting the frequency signal generator and each said segment of each electrode, wherein a certain designated number of electrodes and segments receive a positive signal from said frequency signal generator and a certain designated number of electrodes and segments receive a negative signal from said frequency signal generator, and periodically varying voltages of different frequencies may be applied to each segment; a recording-display means and sampling resistors positioned in the circuit between said frequency signal generator and said electrodes and connected to the recording-display means whereby changes in current created by sample irregularities will be recorded and displayed.
Claim 3
Dependent Claim
27 words
A system for determining irregularities in large samples according to claim 1 wherein said linear electrodes are positioned in a symmetrical array, having a designated central electrode.
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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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |