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US2204196A
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Method and apparatus for determining the nature of borehole fluids
Assignee: Shell Development Co
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Filing: 1938-11-07
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Granted: 1940-06-11
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Expires: 1958-11-07
Abstract
No abstract record available.
Inventors
- 👤 Straatman Alphons Gerar Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:36
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/087; E21B49/088; G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/265; E21B47/00; E21B47/10; E21B47/113
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) | 1943-06-11 | 1943-12-11 | 1944-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-11 | 1947-12-11 | 1948-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-11 | 1951-12-11 | 1952-06-11 | $7700.00 | Window Closed / Lapsed |