US3011554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for investigating earth formations
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1956-01-23
•
Granted: 1961-12-05
•
Expires: 1976-01-23
Abstract
No abstract record available.
Inventors
- 👤 Desbrandes Robert
- 👤 Roger Q Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:05
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2249815A
Cited
US2441894A
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US2433828A
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US2491273A
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US2607222A
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US2582719A
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US2674313A
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US2686039A
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US2629444A
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US2612346A
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US2711186A
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US2725283A
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US2746550A
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US2745497A
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US2813585A
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US2821256A
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US2851107A
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US2799350A
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US2780290A
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US2802200A
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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) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |