US2944607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubing tester and circulating valve
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1953-11-24
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Granted: 1960-07-12
•
Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:53
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; E21B47/00; E21B47/10; E21B47/117; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87378; Y10T137/87394
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US668355A
Cited
US967772A
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US1290408A
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US1419471A
Cited
US1542704A
Cited
US2189103A
Cited
US2742093A
Cited
US2799345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |