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US2823349A
Expired / Lapsed
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Electrical well logging
Assignee: Phillips Petroleum Co
•
Filing: 1953-08-10
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Granted: 1958-02-11
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Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Louis N French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2242612A
Cited
US2199367A
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US2347794A
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US2476137A
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US2427950A
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US2400678A
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US2446303A
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US2592125A
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GB691721A
Cited
US2655632A
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US2633485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |