US2739652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well fluid stabilizer
Assignee: Individual
•
Filing: 1950-03-21
•
Granted: 1956-03-27
•
Expires: 1970-03-21
Abstract
No abstract record available.
Inventors
- 👤 Arlis C Hartsell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:16
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1127428A
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US1898261A
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US1988397A
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US2098484A
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US2092843A
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US2122754A
Cited
US2274940A
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US2641322A
Cited
US2633202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |