Patent US4580034A successfully refreshed from Google Patents.
Patent US4284370A successfully refreshed from Google Patents.
Patent US4987688A successfully refreshed from Google Patents.
US2617331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear finishing
Assignee: Nachi Machining Technology Co
•
Filing: 1946-09-03
•
Granted: 1952-11-11
•
Expires: 1966-09-03
Abstract
No abstract record available.
Inventors
- 👤 Sr Donald D Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:56
CPC Classifications
B; B23; B23F; B23F19/00; B23F19/06; Y; Y10; Y10T; Y10T409/00; Y10T409/10; Y10T409/101431; Y10T409/10477; Y10T409/105088
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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |