Patent US2969839A successfully refreshed from Google Patents.
US2969839A
Expired / Lapsed
US
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Apparatus for forming a closure in a well bore
Assignee: Individual
•
Filing: 1957-05-17
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Granted: 1961-01-31
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Expires: 1977-05-17
Abstract
No abstract record available.
Inventors
- 👤 Haskell M Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:08
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/136
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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |