US3496455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for investigating earth formations including multiple frequency operation and phase correction and quadrature phase cancellation using a magnetic core
Assignee: Services Petroliers Schlumberger SA
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Filing: 1965-02-02
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Granted: 1970-02-17
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Expires: 1985-02-02
Abstract
No abstract record available.
Inventors
- 👤 Michael Marie Albert Gouilloud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:29
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18; G01V3/08; G01V3/10; G01V3/104; G01V3/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220788A
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US2406870A
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US2741757A
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US3051892A
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US3147429A
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US3164993A
Cited
US3187252A
Cited
US3259837A
Cited
US3328679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |