Patent US2651368A successfully refreshed from Google Patents.
US2651368A
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Plug and valve device for casing apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1949-11-14
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Granted: 1953-09-08
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Expires: 1969-11-14
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Austin Benjamin Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:47
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/14; E21B34/142; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1782; Y10T137/1797; Y10T137/1804
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312695A
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US1509386A
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US1822925A
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US1812888A
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US2295418A
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US2343901A
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US2382578A
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US2493650A
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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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |