US3328679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic well logging systems with means for modulating the detected signals
Assignee: Schlumberger Technology Corp
•
Filing: 1964-11-13
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Granted: 1967-06-27
•
Expires: 1984-11-13
Abstract
No abstract record available.
Inventors
- 👤 William J Sloughter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:50
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN APPARATUS FOR INVESTIGATING AN ELECTRICAL PROPERTY OF EARTH FORMATIONS TRANVERSED BY A BOREHOLE, THE COMBINATION COMPRISING A TRANSMITTER AND A RECEIVER COIL SPACED FOR LONGITUDINAL MOVEMENT THROUGH A BOREHOLE, MEANS FOR ENERGIZING SAID TRANSMITTER COIL TO INDUCE IN SAID RECEIVER COIL A SIGNAL HAVING A COMPONENT DEPENDENT UPON THE CONDUCTIVITY OF ADJACENT FORMATIONS, PHASE SENSITIVE DETECTING MEANS RESPONSIVE TO SAID SIGNAL COMPONENT FOR PRODUCING A MEASURE SIGNAL REPRESENTING FORMATION CONDUCTIVITY, MEANS FOR MODULATING THE AMPLITUDE OF SAID SIGNAL COMPONENT PERIODICALLY TO VARY SAID MEASURE SIGNAL AND THEREBY IMPART A READILY INDENTIFIABLE CHARAC-
Claim 2
Dependent Claim
93 words
IN APPARATUS FOR INVESTIGATING AN ELECTRICAL PROPERTY OF EARTH FORMATIONS TRANVERSED BY A BOREHOLE, THE COMBINATION COMPRISING A TRANSMITTER AND A RECEIVER COIL SPACED FOR LONGITUDINAL MOVEMENT THROUGH A BOREHOLE, MEANS FOR ENERGIZING SAID TRANSMITTER COIL TO INDUCE IN SAID RECEIVER COIL A SIGNAL HAVING A COMPONENT DEPENDENT UPON THE CONDUCTIVITY OF ADJACENT FORMATIONS, PHASE SENSITIVE DETECTING MEANS RESPONSIVE TO SAID SIGNAL COMPONENT FOR PRODUCING A MEASURE SIGNAL REPRESENTING FORMATION CONDUCTIVITY, MEANS FOR MODULATING THE AMPLITUDE OF SAID SIGNAL COMPONENT PERIODICALLY TO VARY SAID MEASURE SIGNAL AND THEREBY IMPART A READILY INDENTIFIABLE CHARAC-
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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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |