US2636563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well finishing tool
Assignee: CARROLL V RADKE
•
Filing: 1948-03-12
•
Granted: 1953-04-28
•
Expires: 1968-03-12
Abstract
No abstract record available.
Inventors
- 👤 Derrial O Rollins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:47
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1920103A
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US2133272A
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US2144850A
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US2132081A
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US2246811A
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US2192236A
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US2241439A
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US2431751A
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US2374169A
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US2401119A
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US2508286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |