Patent US3211233A successfully refreshed from Google Patents.
US3211233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well anchor comprising pressure operated means engaging the expanding means for preventing movement thereof because of pressure surges inside inner conduit
Assignee: Individual
•
Filing: 1962-10-08
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Granted: 1965-10-12
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Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Joe R Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:31
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3128826A
Cited
US2187482A
Cited
US3011558A
Cited
US3096824A
Cited
US3055431A
Cited
US3074484A
Cited
US3045757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |