Patent US2558341A successfully refreshed from Google Patents.
US2558341A
Expired / Lapsed
US
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Auger rock drill bit
Assignee: Individual
•
Filing: 1949-03-11
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Granted: 1951-06-26
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Expires: 1969-03-11
Abstract
No abstract record available.
Inventors
- 👤 Cory Frank Lawrence
- 👤 Hayden Ernest Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/003; E21B10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US658060A
Cited
US1292608A
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US1370492A
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US1547459A
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US1734469A
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US1868074A
Cited
US2194267A
Cited
US2464781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |