Patent US2806372A successfully refreshed from Google Patents.
US2806372A
Expired / Lapsed
US
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Borehole logging apparatus
Assignee: Individual
•
Filing: 1952-02-01
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Granted: 1957-09-17
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Expires: 1972-02-01
Abstract
No abstract record available.
Inventors
- 👤 Jan J Arps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:43
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/11; E21B49/00; E21B49/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1982184A
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US2214674A
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US2364975A
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US2326219A
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US2315355A
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US2404132A
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US2400046A
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US2436503A
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US2528956A
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US2658725A
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US2714308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |