US3147429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction method and apparatus for investigating earth formation utilizing two quadrature phase components of a detected signal
Assignee: Schlumberger Well Surveying Corp
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Filing: 1960-02-08
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Granted: 1964-09-01
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Expires: 1980-02-08
Abstract
No abstract record available.
Inventors
- 👤 James H Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF INVESTIGATING SUBSURFACE FORMATION MATERIAL ADJACENT A BOREHOLE DRILLED INTO THE EARTH COMPRISING: INDUCING A FLOW OF ALTERNATING CURRENT IN THE FORMATION MATERIAL; OBTAINING AN INDICATION OF THE MAGNITUDE OF A FIRST PHASE COMPONENT OF THE ELECTROMAGNETIC FIELD PRODUCED BY THIS CURRENT FLOW; OBTAINING AN INDICATION OF THE MAGNITUDE OF A SECOND PHASE COMPONENT OF THIS ELECTROMAGNETIC FIELD WHICH IS IN PHASE QUADRATURE WITH THE FIRST PHASE COMPONENT; AND MODIFYING THE FIRST MAGNITUDE INDICATION BY THE SECOND MAGNITUDE INDICATION
Claim 2
Independent Claim
81 words
A METHOD OF INVESTIGATING SUBSURFACE FORMATION MATERIAL ADJACENT A BOREHOLE DRILLED INTO THE EARTH COMPRISING: INDUCING A FLOW OF ALTERNATING CURRENT IN THE FORMATION MATERIAL; OBTAINING AN INDICATION OF THE MAGNITUDE OF A FIRST PHASE COMPONENT OF THE ELECTROMAGNETIC FIELD PRODUCED BY THIS CURRENT FLOW; OBTAINING AN INDICATION OF THE MAGNITUDE OF A SECOND PHASE COMPONENT OF THIS ELECTROMAGNETIC FIELD WHICH IS IN PHASE QUADRATURE WITH THE FIRST PHASE COMPONENT; AND MODIFYING THE FIRST MAGNITUDE INDICATION BY THE SECOND MAGNITUDE INDICATION
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |