Patent US2597669A successfully refreshed from Google Patents.
US2597669A
Expired / Lapsed
US
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Drill bit
Assignee: Inspiration Mining & Dev Compa
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Filing: 1950-01-20
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Granted: 1952-05-20
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Expires: 1970-01-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Pilon
- 👤 Beaulieu Anede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:15
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/06; E21B10/46; E21B10/48; E21B10/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |