Patent US2657906A successfully refreshed from Google Patents.
US2657906A
Expired / Lapsed
US
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Earth drill
Assignee: BUDA CO
•
Filing: 1947-09-18
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Granted: 1953-11-03
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Expires: 1967-09-18
Abstract
No abstract record available.
Inventors
- 👤 Richards Dwight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:48
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2272684A
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US2202216A
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US2334312A
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US2410959A
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US2418601A
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US2421970A
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US2502895A
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US2415572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |