Patent US4995469A successfully refreshed from Google Patents.
Patent US3051246A successfully refreshed from Google Patents.
US3051246A
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Automatic fluid fill apparatus for subsurface conduit strings
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1959-04-13
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Granted: 1962-08-28
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Expires: 1979-04-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Earnest H Clark
- 👤 Julian D Keithahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:29
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/1677; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7856; Y10T137/8593; Y10T137/87917; Y10T137/88022; Y10T137/8803
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2717648A
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US2748873A
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US2874785A
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US2884938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |