Patent US2750557A successfully refreshed from Google Patents.
US2750557A
Expired / Lapsed
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Electrical logging of subterranean formations
Assignee: Schlumberger Well Surveying Corp
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Filing: 1954-06-04
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Granted: 1956-06-12
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Expires: 1974-06-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Bricaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
WELL LOGGING APPARATUS COMPRISING A FLEXIBLE INSULATING CUSHION MEMBER HAVING AN OUTER FACE CONFORMABLE TO THE WALL OF A BOREHOLE, A FIRST ELECTRODE OF A GENERALLY ELLIPTICAL CONFIGURATION EMBEDDED IN SAID OUTER FACE, AND A SECOND ELECTRODE EMBEDDED IN SAID OUTER FACE ON EITHER SIDE OF SAID FIRST ELECTRODE AND DISPOSED GENERALLY ALONG THE LINE OF INTERSECTION BETWEEN SAID OUTER FACE AND A GENERALLY ELLIPSOIDAL EQUIPOTENTIAL SURFACE CONFOCAL WITH SAID FIRST ELECTRODE, SAID ELECTRODES BEING EXPOSED FOR CONDUCTING CURRENT INTO THE WALL OF A BOREHOLE AND WITH SAID OUTER FACE BEING ELONGATED TO EXTEND LONGITUDINALLY OF A BOREHOLE.
Claim 2
Dependent Claim
98 words
WELL LOGGING APPARATUS COMPRISING A FLEXIBLE INSULATING CUSHION MEMBER HAVING AN OUTER FACE CONFORMABLE TO THE WALL OF A BOREHOLE, A FIRST ELECTRODE OF A GENERALLY ELLIPTICAL CONFIGURATION EMBEDDED IN SAID OUTER FACE, AND A SECOND ELECTRODE EMBEDDED IN SAID OUTER FACE ON EITHER SIDE OF SAID FIRST ELECTRODE AND DISPOSED GENERALLY ALONG THE LINE OF INTERSECTION BETWEEN SAID OUTER FACE AND A GENERALLY ELLIPSOIDAL EQUIPOTENTIAL SURFACE CONFOCAL WITH SAID FIRST ELECTRODE, SAID ELECTRODES BEING EXPOSED FOR CONDUCTING CURRENT INTO THE WALL OF A BOREHOLE AND WITH SAID OUTER FACE BEING ELONGATED TO EXTEND LONGITUDINALLY OF A BOREHOLE.
References Cited (Backward Citations)
US2669690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |