US3132298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for investigating earth boreholes by means of electrodes constructed to contact the borehole walls
Assignee: Schlumberger Well Surveying Corp
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Filing: 1959-06-16
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Granted: 1964-05-05
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Expires: 1979-06-16
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
- 👤 Jean L Dumanoir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:59
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24; G01V11/00; G01V11/002; G01V11/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
WALL-ENGAGING ELECTRODE APPARATUS INCLUDING ONLY THREE ELECTRODES FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE COMPRISING: A WALL-ENGAGING METAL PAD HAVING A RECESS CUT INTO A CENTRAL PORTION OF THE WALLENGAGING FACE THEREOF: A FIRST ELECTRODE LOCATED IN THE RECESS AND ELECTRICALLY-INSULATED FROM THE PAD PROPER; AND A SECOND ELECTRODE LOCATED IN THE RECESS ENCIRCLING THE FIRST ELECTRODE AND ELECTRICALLY INSULATED FROM BOTH THE FIRST ELECTRODE AND THE PAD PROPER; THE PAD PROPER CONSTITUTING THE THIRD OF THE THREE 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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |