US2596437A
Expired / Lapsed
US
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Method and apparatus for detecting fluid movement in well bores
Assignee: California Research LLC
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Filing: 1951-02-16
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Granted: 1952-05-13
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Expires: 1971-02-16
Abstract
No abstract record available.
Inventors
- 👤 Gilson H Rohrback
- 👤 Robert A Stoner
- 👤 Macaulay Malcolm
- 👤 Jr William T Cardwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:11
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |