US2936832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crossover apparatus for dual production well strings
Assignee: BROWN
•
Filing: 1957-03-27
•
Granted: 1960-05-17
•
Expires: 1977-03-27
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
- 👤 Chudleigh B Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2304303A
Cited
US2368428A
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US2766831A
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US2649916A
Cited
US2717041A
Cited
US2776013A
Cited
US2822048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |