Patent US2578593A successfully refreshed from Google Patents.
US2578593A
Expired / Lapsed
US
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Auger-type drill bit
Assignee: Individual
•
Filing: 1946-10-29
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Granted: 1951-12-11
•
Expires: 1966-10-29
Abstract
No abstract record available.
Inventors
- 👤 Phipps Orville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/54
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |