US2947361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable tester for oil wells
Assignee: Halliburton Oil Well Cementing Co
•
Filing: 1958-07-25
•
Granted: 1960-08-02
•
Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 Walter E Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2313369A
Cited
US2535342A
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US2640542A
Cited
US2688369A
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US2780292A
Cited
US2623594A
Cited
US2799347A
Cited
US2886109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |