US3179879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well logging apparatus with means for modifying one signal component by a second signal component when a predetermined condition occurs
Assignee: Schlumberger Well Surveying Corp
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Filing: 1960-05-16
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Granted: 1965-04-20
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Expires: 1980-05-16
Abstract
No abstract record available.
Inventors
- 👤 Denis R Tanguy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:20
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN INDUCTION LOGGING APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE, THE COMBINATION COMPRISING: A COIL SYSTEM ADAPTED FOR MOVEMENT THROUGH THE BOREHOLE; MEANS FOR ENERGIZING THE COIL SYSTEM WITH ALTERNATING CURRENT TO DEVELOP A SIGNAL WHICH IS DEPENDENT ON THE ELECTRICAL CHARACTERISTICS OF THE ADJACEN FORMATION MATERIAL; FIRST PHASE SENSITIVE CIRCUIT MEANS RESPONSIVE TO THE MAGNITUDE OF A FIRST PHASE COMPONENT OF THE COIL SYSTEM SIGNAL FOR DEVELOPING A FIRST OUTPUT SIGNAL; SECOND PHASE SENSITIVE CIRCUIT MEANS RESPONSIVE TO THE MAGNITUDE OF A SECOND PHASE COMPONENT OF THE COIL SYSTEM SIGNAL FOR DEVELOPING A SECOND OUTPUT SIGNAL, THIS SECOND PHSE COMPONENT BEING IN PHASE QUADRATURE WITH THE FIRST PHASE COMPONENT; MEANS RESPONSIVE TO THE SECOND OUTPUT SIGNAL FOR MINIMIZING THE SECOND PHASE COMPONENT WHENEVER THE FIRST OUTPUT SIGNAL IS WITHIN A PREDETERMINED RANGE OF VALUES; MEANS FOR MODIFYING THE FIRST OUTPUT SIGNAL AS A FUNCTION OF THE SECOND OUTPUT SIGNAL WHENEVER THE FIRST OUTPUT SIGNAL FALLS OUTSIDE OF THE PREDETERMINED RANGE
Claim 2
Dependent Claim
163 words
IN INDUCTION LOGGING APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE, THE COMBINATION COMPRISING: A COIL SYSTEM ADAPTED FOR MOVEMENT THROUGH THE BOREHOLE; MEANS FOR ENERGIZING THE COIL SYSTEM WITH ALTERNATING CURRENT TO DEVELOP A SIGNAL WHICH IS DEPENDENT ON THE ELECTRICAL CHARACTERISTICS OF THE ADJACEN FORMATION MATERIAL; FIRST PHASE SENSITIVE CIRCUIT MEANS RESPONSIVE TO THE MAGNITUDE OF A FIRST PHASE COMPONENT OF THE COIL SYSTEM SIGNAL FOR DEVELOPING A FIRST OUTPUT SIGNAL; SECOND PHASE SENSITIVE CIRCUIT MEANS RESPONSIVE TO THE MAGNITUDE OF A SECOND PHASE COMPONENT OF THE COIL SYSTEM SIGNAL FOR DEVELOPING A SECOND OUTPUT SIGNAL, THIS SECOND PHSE COMPONENT BEING IN PHASE QUADRATURE WITH THE FIRST PHASE COMPONENT; MEANS RESPONSIVE TO THE SECOND OUTPUT SIGNAL FOR MINIMIZING THE SECOND PHASE COMPONENT WHENEVER THE FIRST OUTPUT SIGNAL IS WITHIN A PREDETERMINED RANGE OF VALUES; MEANS FOR MODIFYING THE FIRST OUTPUT SIGNAL AS A FUNCTION OF THE SECOND OUTPUT SIGNAL WHENEVER THE FIRST OUTPUT SIGNAL FALLS OUTSIDE OF THE PREDETERMINED RANGE
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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |