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US2653294A
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Apparatus for electrical well logging
Assignee: Phillips Petroleum Co
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Filing: 1949-04-21
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Granted: 1953-09-22
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Expires: 1969-04-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred L Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:54
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US396176A
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US1254927A
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US1859311A
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US2174638A
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US2317259A
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US2357178A
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US2459196A
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US2307887A
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US2390409A
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US2404622A
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US2393009A
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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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |