Patent US2640547A successfully refreshed from Google Patents.
US2640547A
Expired / Lapsed
US
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Gas-operated well apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1948-01-12
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Granted: 1953-06-02
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Expires: 1968-01-12
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Thomas M Ragan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:41
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06; E21B23/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1275462A
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US1582184A
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US2043340A
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US2320340A
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US2189937A
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US2266382A
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US2338157A
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US2373006A
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US2436036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |