Patent US2655216A successfully refreshed from Google Patents.
US2655216A
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US
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Positive shutoff ported casing apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1948-04-23
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Granted: 1953-10-13
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Expires: 1968-04-23
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Austin Benjamin Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:18
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2370833A
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US2438992A
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US2442544A
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US2382578A
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US2435016A
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US2429912A
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US2488819A
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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) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |