Patent US2858099A successfully refreshed from Google Patents.
US2858099A
Expired / Lapsed
US
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Subsurface fluid control valve
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1954-12-31
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Granted: 1958-10-28
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Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 Jr William S Althouse
- 👤 Martin B Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:09
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2614795A
Cited
US2703696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |