Patent US4397075A successfully refreshed from Google Patents.
US2687282A
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Reaming bit structure for earth bores
Assignee: Eastman Oil Well Survey Co
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Filing: 1952-01-21
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Granted: 1954-08-24
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Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 Eric L Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:51
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1902174A
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US2227233A
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US2194267A
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US2266383A
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US2357330A
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US2515365A
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US2589534A
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US2553874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |