US2642268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering lost circulation in drilling wells
Assignee: Individual
•
Filing: 1948-02-28
•
Granted: 1953-06-16
•
Expires: 1968-02-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Armentrout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:48
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1761875A
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US1960435A
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US1885081A
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US2058309A
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US2064936A
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US2217926A
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US2191652A
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US2338174A
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US2417307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |