Patent US2996618A successfully refreshed from Google Patents.
US2996618A
Expired / Lapsed
US
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Well logging methods and apparatus
Assignee: Schlumberger Well Surveying Corp
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Filing: 1954-07-13
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Granted: 1961-08-15
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Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 Goodman Clark
- 👤 John T Dewan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:29
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2712081A
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US2296176A
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US2469461A
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US2469462A
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US2489436A
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US2648780A
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US2763788A
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US2752504A
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US2689918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |