Patent US2189703A successfully refreshed from Google Patents.
US2189703A
Expired / Lapsed
US
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Well production apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1939-07-25
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Granted: 1940-02-06
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Expires: 1959-07-25
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Burt
- 👤 Jr Eugene Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; E21B33/00; E21B33/10; E21B33/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-02-05 | 1943-08-07 | 1944-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-05 | 1947-08-07 | 1948-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-05 | 1951-08-07 | 1952-02-06 | $7700.00 | Window Closed / Lapsed |