Patent US2991833A successfully refreshed from Google Patents.
US2991833A
Expired / Lapsed
US
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Methods of and apparatus for completing multiple zone wells
Assignee: BROWN
•
Filing: 1957-04-26
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Granted: 1961-07-11
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Expires: 1977-04-26
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
- 👤 Chudleigh B Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:48
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; E21B33/00; E21B33/10; E21B33/12; E21B33/122; E21B33/129; E21B33/1295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1014272A
Cited
US2187635A
Cited
US2231282A
Cited
US2451762A
Cited
US2605637A
Cited
US2780291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |