Patent US2719948A successfully refreshed from Google Patents.
US2719948A
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US
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Magnetically investigating material at the wall of a well bore
Assignee: Schlumberger Well Surveying Corp
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Filing: 1952-05-28
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Granted: 1955-10-04
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Expires: 1972-05-28
Abstract
No abstract record available.
Inventors
- 👤 Carl W Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:45
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1815717A
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US2246460A
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US2353211A
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US2441380A
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US2527170A
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US2531414A
Cited
US2535666A
Cited
US2540589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |