US2869645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the flow of fluids in a multi-strata well
Assignee: Richfield Oil Corp
•
Filing: 1954-12-08
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Granted: 1959-01-20
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Richard O Chamberlain
- 👤 Jr Charles E Wakefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:17
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318352A
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US1262107A
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US2307171A
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US2373647A
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US2537066A
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US2679903A
Cited
US2679904A
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US2760578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |