US2884227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drill bit for large holes
Assignee: Sandvik AB
•
Filing: 1956-06-27
•
Granted: 1959-04-28
•
Expires: 1976-06-27
Abstract
No abstract record available.
Inventors
- 👤 Hjalsten John Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1785405A
Cited
US1813375A
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US2282596A
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US2358052A
Cited
US2502128A
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US2807443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |