US3150314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electromagnetically in-vestigating earth formations including means for obtaining a resistivity signal directly
Assignee: Schlumberger Well Surveying Corp
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Filing: 1958-06-16
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Granted: 1964-09-22
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Expires: 1978-06-16
Abstract
No abstract record available.
Inventors
- 👤 Denis R Tanguy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:51
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE, THE COMBINATION COMPRISING: A COIL ARRAY INCLUDING A TRANSMITTER COIL AND A RECEIVER COIL ADAPTED FOR MOVEMENT THROUGH THE BOREHOLE; CIRCUIT MEANS FOR SUPPLYING CURRENT TO THE TRANSMITTER COIL FOR DEVELOPING IN THE RECEIVER COIL A SIGNAL REPRESENTATIVE OF A FORMATION ELECTRICAL CHARACTERISTIC; MEANS RESPONSIVE TO THE RECEIVER COIL SIGNAL FOR ADJUSTING THE TRANSMITTER COIL CURRENT TO HOLD SUCH RECEIVER COIL SIGNAL TO A PREDETERMINED SIGNAL CONDITION; AND MEANS RESPONSIVE TO THE TRANSMITTER COIL CURRENT FOR PROVIDING INDICATIONS OF FORMATION RESISTIVITY.
Claim 2
Dependent Claim
91 words
IN APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE, THE COMBINATION COMPRISING: A COIL ARRAY INCLUDING A TRANSMITTER COIL AND A RECEIVER COIL ADAPTED FOR MOVEMENT THROUGH THE BOREHOLE; CIRCUIT MEANS FOR SUPPLYING CURRENT TO THE TRANSMITTER COIL FOR DEVELOPING IN THE RECEIVER COIL A SIGNAL REPRESENTATIVE OF A FORMATION ELECTRICAL CHARACTERISTIC; MEANS RESPONSIVE TO THE RECEIVER COIL SIGNAL FOR ADJUSTING THE TRANSMITTER COIL CURRENT TO HOLD SUCH RECEIVER COIL SIGNAL TO A PREDETERMINED SIGNAL CONDITION; AND MEANS RESPONSIVE TO THE TRANSMITTER COIL CURRENT FOR PROVIDING INDICATIONS OF FORMATION RESISTIVITY.
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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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |