Patent US3775670A successfully refreshed from Google Patents.
Patent US2634098A successfully refreshed from Google Patents.
US2634098A
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Means and method of recovering lost circulation in drilling wells
Assignee: Individual
•
Filing: 1948-02-28
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Granted: 1953-04-07
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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
2026-10-26 18:42
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1352623A
Cited
US1781105A
Cited
US1807082A
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US1939391A
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US1953898A
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US2221175A
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US2223789A
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US2224120A
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US2347464A
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US2342588A
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US2387514A
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US2380156A
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US2311389A
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US2365033A
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US2456437A
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US2445928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |