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Patent US2338991A successfully refreshed from Google Patents.
US2338991A
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US
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Magnetic well logging
Assignee: Lane Wells Co
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Filing: 1940-10-19
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Granted: 1944-01-11
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Expires: 1960-10-19
Abstract
No abstract record available.
Inventors
- 👤 James C Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-01-10 | 1947-07-12 | 1948-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-01-10 | 1951-07-12 | 1952-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-01-10 | 1955-07-12 | 1956-01-11 | $7700.00 | Window Closed / Lapsed |