Patent US2984451A successfully refreshed from Google Patents.
US2984451A
Expired / Lapsed
US
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Subsurface valve apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1958-04-21
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Granted: 1961-05-16
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Expires: 1978-04-21
Abstract
No abstract record available.
Inventors
- 👤 Martin B Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:15
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1218030A
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US1690183A
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US2124155A
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US2690895A
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US2591514A
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US2847182A
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US2815187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |