Patent US2361261A successfully refreshed from Google Patents.
US2361261A
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Method of detecting the penetration of an oil-bearing horizon
Assignee: RALPH H FASH
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Filing: 1940-10-09
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Granted: 1944-10-24
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Expires: 1960-10-09
Abstract
No abstract record available.
Inventors
- 👤 John G Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/005; G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; Y; Y10; Y10S; Y10S435/00; Y10S435/808
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) | 1947-10-24 | 1948-04-24 | 1948-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-10-24 | 1952-04-24 | 1952-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-10-24 | 1956-04-24 | 1956-10-24 | $7700.00 | Window Closed / Lapsed |