Patent US2814348A successfully refreshed from Google Patents.
US2814348A
Expired / Lapsed
US
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Extensible means for circulating fluids through wells
Assignee: Otis Engineering Corp
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Filing: 1953-08-10
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Granted: 1957-11-26
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Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Harry B Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1291
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1503476A
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US2035326A
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US2174121A
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US2636563A
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US2749989A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |