Patent US3553898A successfully refreshed from Google Patents.
US3553898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill sharpening apparatus or the like
Assignee: SERVICE PRECISION GRINDING COMPANY Inc A CORP OF NJ
•
Filing: 1968-03-29
•
Granted: 1971-01-12
•
Expires: 1988-03-29
Abstract
Abstract IMPROVED DRILL SHARPENING APPARATUS IF DISCLOSED COMPRISING (1) A MOTOR HAVING A SHAFT, (2) A THIN WALLED TUBULAR GRINDSTONE MOUNTED BY ONE OF ITS ENDS TO THE SHAFT, (3) AND DRILL HOLDING APPARATUS FOR MOVING A DRILL ACROSS THE END WALL OF THE GRINDSTONE AND INTO ITS HOLLOW PORTION DURING A SHARPENING OPERATION.
Inventors
- 👤 Alfred Nobile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:20
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |