US2773168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-speed spark machining apparatus
Assignee: Firth Sterling Inc
•
Filing: 1953-01-22
•
Granted: 1956-12-04
•
Expires: 1973-01-22
Abstract
No abstract record available.
Inventors
- 👤 Everard M Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:42
CPC Classifications
B; B23; B23H; B23H1/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2179105A
Cited
US2235385A
Cited
GB548618A
Cited
US2295293A
Cited
US2405069A
Cited
US2404971A
Cited
US2415116A
Cited
US2459858A
Cited
US2451496A
Cited
GB637793A
Cited
US2537990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |