Patent US2689108A successfully refreshed from Google Patents.
US2689108A
Expired / Lapsed
US
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Rock drill bit with hard m etal cutting insert
Assignee: Sandvik AB
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Filing: 1951-07-02
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Granted: 1954-09-14
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Expires: 1971-07-02
Abstract
No abstract record available.
Inventors
- 👤 Haglund Didrik Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2019934A
Cited
US1949050A
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US2032328A
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US2121202A
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DE686029C
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US2243608A
Cited
FR886835A
Cited
GB634743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |