Patent US4415909A successfully refreshed from Google Patents.
Patent US2628072A successfully refreshed from Google Patents.
US2628072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit having groove with hard metal cutter insert brazed therein
Assignee: Timken Co
•
Filing: 1949-09-01
•
Granted: 1953-02-10
•
Expires: 1969-09-01
Abstract
No abstract record available.
Inventors
- 👤 John B Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:31
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |