Patent US4043531A successfully refreshed from Google Patents.
Patent US3267366A successfully refreshed from Google Patents.
US3267366A
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Apparatus for detecting magnetic anomalies
Assignee: Services Petroliers Schlumberger SA
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Filing: 1963-09-12
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Granted: 1966-08-16
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Expires: 1983-09-12
Abstract
No abstract record available.
Inventors
- 👤 Bricaud Joseph Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:10
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B47/00; E21B47/09; E21B47/092; G; G01; G01V; G01V3/00; G01V3/18; G01V3/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
APPARATUS FOR DETECTING MAGNETIC ANOMALIES IN A CASED BOREHOLE COMPRISING: AN ELONGATED SUPPORT MEMBER ADAPTED FOR MOVEMENT THROUGH A CASE BOREHOLE; CENTRALIZER MEANS COUPLED TO THE SUPPORT MEMBER AND INCLUDING A PLURALITY OF WALL-ENGAGING MEMBERS FOR KEEPING THE SUPPORT MEMBER IN A CENTRAL POSITION IN THE BOREHOLE; A PLURALITY OF MAGNET MEANS INDIVIDUALLY LOCATED ON DIFFERENT ONES OF THE WALL-ENGAGING MEMBERS AND INDIVIDUALLY GENERATING A MAGNETIC FLUX FIELD WHICH PASSES THROUGH THE CASING; AND MEANS FOR DETECTING VARIATIONS IN THE MAGNETIC FLUX FIELDS, WHEREBY AT LEAST ONE OF THE WALL-ENGAGING
Claim 2
Dependent Claim
90 words
APPARATUS FOR DETECTING MAGNETIC ANOMALIES IN A CASED BOREHOLE COMPRISING: AN ELONGATED SUPPORT MEMBER ADAPTED FOR MOVEMENT THROUGH A CASE BOREHOLE; CENTRALIZER MEANS COUPLED TO THE SUPPORT MEMBER AND INCLUDING A PLURALITY OF WALL-ENGAGING MEMBERS FOR KEEPING THE SUPPORT MEMBER IN A CENTRAL POSITION IN THE BOREHOLE; A PLURALITY OF MAGNET MEANS INDIVIDUALLY LOCATED ON DIFFERENT ONES OF THE WALL-ENGAGING MEMBERS AND INDIVIDUALLY GENERATING A MAGNETIC FLUX FIELD WHICH PASSES THROUGH THE CASING; AND MEANS FOR DETECTING VARIATIONS IN THE MAGNETIC FLUX FIELDS, WHEREBY AT LEAST ONE OF THE WALL-ENGAGING
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |