US3340464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction investigation apparatus having time shared operations including phase calibration
Assignee: Services Petroliers Schlumberger SA
•
Filing: 1963-07-03
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Granted: 1967-09-05
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Expires: 1983-07-03
Abstract
No abstract record available.
Inventors
- 👤 Gouilloud Michel Marie Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/105; B; B43; B43K; B43K5/00; B43K5/18; G01N; G01N27/00; G01N27/02; G01N27/023; G01N27/025; G01N27/72; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
INDUCTION APPARATUS FOR INVESTIGATING VARIOUS MATERIALS COMPRISING: A TRANSMITTER COIL FOR INDUCING CURRENT FLOW IN THE MATERIAL BEING INVESTIGATED; A RECEIVER COIL FOR DEVELOPING A SIGNAL REPRESENTATIVE OF THE INDUCED CURRENT FLOW; CIRCUIT MEANS FOR SUPPLYING ENERGIZING CURRENT TO THE TRANSMITTER COIL; AMPLIFIER CIRCUIT MEANS FOR AMPLIFYING THE RECEIVER COIL SIGNAL; PHASE SENSITIVE CIRCUIT MEANS COUPLED TO THE OUTPUT OF THE AMPLIFIER CIRCUIT MEANS; CIRCUIT MEANS FOR SUPPLYING A PHASE REFERENCE SIGNAL TO THE PHASE SENSITIVE CIRCUIT MEANS; CIRCUIT MEANS FOR SUPPLYING TO THE INPUT OF THE AMPLIFIER CIRCUIT MEANS A PHASE CALIBRATION SIGNAL HAVING A KNOWN PHASE RELATIONSHIP WITH RESPECT TO THE TRANSMITTER COIL CURRENT; AND CIRCUIT MEANS FOR ADJUSTING ONE OF THE TRANSMITTER COIL CURRENT AND THE PHASE REFERENCE SIGNAL FOR PROVIDING A PREDETERMINED PHASE RELATIONSHIP BETWEEN THE AMPLIFIED PHASE CALIBRATION SIGNAL AND THE PHASE REFERENCE SIGNAL.
Claim 2
Dependent Claim
139 words
INDUCTION APPARATUS FOR INVESTIGATING VARIOUS MATERIALS COMPRISING: A TRANSMITTER COIL FOR INDUCING CURRENT FLOW IN THE MATERIAL BEING INVESTIGATED; A RECEIVER COIL FOR DEVELOPING A SIGNAL REPRESENTATIVE OF THE INDUCED CURRENT FLOW; CIRCUIT MEANS FOR SUPPLYING ENERGIZING CURRENT TO THE TRANSMITTER COIL; AMPLIFIER CIRCUIT MEANS FOR AMPLIFYING THE RECEIVER COIL SIGNAL; PHASE SENSITIVE CIRCUIT MEANS COUPLED TO THE OUTPUT OF THE AMPLIFIER CIRCUIT MEANS; CIRCUIT MEANS FOR SUPPLYING A PHASE REFERENCE SIGNAL TO THE PHASE SENSITIVE CIRCUIT MEANS; CIRCUIT MEANS FOR SUPPLYING TO THE INPUT OF THE AMPLIFIER CIRCUIT MEANS A PHASE CALIBRATION SIGNAL HAVING A KNOWN PHASE RELATIONSHIP WITH RESPECT TO THE TRANSMITTER COIL CURRENT; AND CIRCUIT MEANS FOR ADJUSTING ONE OF THE TRANSMITTER COIL CURRENT AND THE PHASE REFERENCE SIGNAL FOR PROVIDING A PREDETERMINED PHASE RELATIONSHIP BETWEEN THE AMPLIFIED PHASE CALIBRATION SIGNAL AND THE PHASE REFERENCE SIGNAL.
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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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |