US2947359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining direction of fluid flow in boreholes
Assignee: Union Oil Company of California
•
Filing: 1957-04-08
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Granted: 1960-08-02
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Expires: 1977-04-08
Abstract
No abstract record available.
Inventors
- 👤 Virgil A Josendal
- 👤 Richard J Stegemeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:08
CPC Classifications
E; E21; E21B; E21B49/00; G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; E21B47/00; E21B47/10; E21B47/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2364975A
Cited
US2358945A
Cited
US2316361A
Cited
US2339129A
Cited
US2564198A
Cited
US2652496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |