US2503115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination reaming and cementing apparatus and method of forming cement plugs within well bores
Assignee: Eastman Oil Well Survey Co
•
Filing: 1945-03-26
•
Granted: 1950-04-04
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Expires: 1965-03-26
Abstract
No abstract record available.
Inventors
- 👤 Herman G Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:42
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1515819A
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US1535572A
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US1738860A
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US2167194A
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US2177601A
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US2107327A
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US2164195A
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US2312789A
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US2249732A
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US2374317A
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US2402223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |