Patent US2806532A successfully refreshed from Google Patents.
US2806532A
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Method and apparatus for pressuring well bores
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1953-10-12
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Granted: 1957-09-17
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Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Martin B Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:26
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1920103A
Cited
US2051713A
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US2122749A
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US2378469A
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US2327092A
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US2368400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |