US2688872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for fluid entry logging
Assignee: Stanolind Oil and Gas Co
•
Filing: 1949-06-08
•
Granted: 1954-09-14
•
Expires: 1969-06-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Hartline
- 👤 Joseph D Eisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:20
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; E; E21; E21B; E21B47/00; E21B47/04; E21B47/047; E21B47/10; E21B47/113; G01F1/115
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143962A
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US2270141A
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US2248982A
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US2218155A
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US2295738A
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US2299406A
Cited
US2379106A
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US2517603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |