Patent US3635214A successfully refreshed from Google Patents.
US2790137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical prospecting method and apparatus
Assignee: Sunoco Inc
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Filing: 1953-06-12
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Granted: 1957-04-23
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Expires: 1973-06-12
Abstract
No abstract record available.
Inventors
- 👤 Fred M Mayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:30
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/02; G01V3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
APPARATUS FOR ELECTRICAL PROSPECTING COMPRISING A PAIR OF CURRENT ELECTRODES IN ELECTRICAL CONTACT WITH THE EARTH, MEANS FOR INTRODUCING CURRENT INTO THE EARTH THROUGH SAID ELECTRODES, A PAIR OF POTENTIAL ELECTRODES IN ELECTRICAL CONTACT WITH THE EARTH AND SUMMETRICALLY DISPOSED RELATIVE TO A POINT CENTRALLY LOCATED WITH RESPECT TO SAID CURRENT ELELCTRODES, AND MEASURING MEANS RESPONSIVE TO THE ALGEBRAIC SUM OF THE POTENTIALS OF SAID POTENTIAL ELECTRODES WITH RESPECT TO A COMMON DATUM.
Claim 2
Dependent Claim
73 words
APPARATUS FOR ELECTRICAL PROSPECTING COMPRISING A PAIR OF CURRENT ELECTRODES IN ELECTRICAL CONTACT WITH THE EARTH, MEANS FOR INTRODUCING CURRENT INTO THE EARTH THROUGH SAID ELECTRODES, A PAIR OF POTENTIAL ELECTRODES IN ELECTRICAL CONTACT WITH THE EARTH AND SUMMETRICALLY DISPOSED RELATIVE TO A POINT CENTRALLY LOCATED WITH RESPECT TO SAID CURRENT ELELCTRODES, AND MEASURING MEANS RESPONSIVE TO THE ALGEBRAIC SUM OF THE POTENTIALS OF SAID POTENTIAL ELECTRODES WITH RESPECT TO A COMMON DATUM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |