Patent US2557302A successfully refreshed from Google Patents.
US2557302A
Expired / Lapsed
US
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Combination drag and rotary drilling bit
Assignee: Individual
•
Filing: 1947-12-12
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Granted: 1951-06-19
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Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
- 👤 Aubrey F Maydew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:47
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US122514A
Cited
US458640A
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US1299619A
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US1348419A
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US1865853A
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US2034073A
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US2053801A
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US2121202A
Cited
US2198849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |