US2730673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetometer
Assignee: Union Oil Company of California
•
Filing: 1947-01-20
•
Granted: 1956-01-10
•
Expires: 1967-01-20
Abstract
No abstract record available.
Inventors
- 👤 Jakosky John Jay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/02; G01V3/04; G01R; G01R33/00; G01R33/02; G01R33/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN APPARATUS FOR DETERMINING THE LOCATION OF ANOMALOUS UNDERGROUND STRUCTURE WHICH COMPRISES ELECTRODES IN CONTACT WITH THE EARTH''S SURFACE AT SPACED POINTS, AN ELECTRIC DIRECT CURRENT GENERATOR, INSULATED CONDUCTORS CONNECTING SAID GENERATOR TO SAID ELECTRODES, A PICK-UP COIL MAINTAINED SUBSTANTIALLY EQUIDISTANT BETWEEN AND ON AN IMAGINARY LINE RUNNING THROUGH SAID ELECTRODES AND A COMPENSATED GALVANOMETER ELECTRICALLY CONNECTED TO SAID PICK-UP COIL, SAID GALVANOMETER BEING MAGNETICALLY COMPENSATED AND CHARACTERIZED BY HAVING SUBSTANTIALLY NO RESTORING TORQUE ASSOCIATED WITH ITS INDICATING MECHANISM WHEREBY SAID COMPENSATED GALVANOMETER REGISTERS AN INDICATION CONSTITUTING A UNIDIRECTIONAL DEFLECTION OF ITS INDICATING MECHANISM UPON AND IN PROPORTION TO A CHANGE IN THE DIRECT CURRENT MAGNETIC FIELD INTENSITY INTERSECTING SAID PICK-UP COIL AND INDUCED BY A CHANGE IN SUBSURFACE DIRECT CURRENT BETWEEN SAID ELECTRODES.
Claim 2
Independent Claim
124 words
AN APPARATUS FOR DETERMINING THE LOCATION OF ANOMALOUS UNDERGROUND STRUCTURE WHICH COMPRISES ELECTRODES IN CONTACT WITH THE EARTH''S SURFACE AT SPACED POINTS, AN ELECTRIC DIRECT CURRENT GENERATOR, INSULATED CONDUCTORS CONNECTING SAID GENERATOR TO SAID ELECTRODES, A PICK-UP COIL MAINTAINED SUBSTANTIALLY EQUIDISTANT BETWEEN AND ON AN IMAGINARY LINE RUNNING THROUGH SAID ELECTRODES AND A COMPENSATED GALVANOMETER ELECTRICALLY CONNECTED TO SAID PICK-UP COIL, SAID GALVANOMETER BEING MAGNETICALLY COMPENSATED AND CHARACTERIZED BY HAVING SUBSTANTIALLY NO RESTORING TORQUE ASSOCIATED WITH ITS INDICATING MECHANISM WHEREBY SAID COMPENSATED GALVANOMETER REGISTERS AN INDICATION CONSTITUTING A UNIDIRECTIONAL DEFLECTION OF ITS INDICATING MECHANISM UPON AND IN PROPORTION TO A CHANGE IN THE DIRECT CURRENT MAGNETIC FIELD INTENSITY INTERSECTING SAID PICK-UP COIL AND INDUCED BY A CHANGE IN SUBSURFACE DIRECT CURRENT BETWEEN SAID ELECTRODES.
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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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |