Patent US2970779A successfully refreshed from Google Patents.
US2970779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Individual
•
Filing: 1957-09-27
•
Granted: 1961-02-07
•
Expires: 1977-09-27
Abstract
No abstract record available.
Inventors
- 👤 John B Duty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:33
CPC Classifications
B; B02; B02C; B02C4/00; B02C4/02; B02C4/28; Y; Y10; Y10T; Y10T83/00; Y10T83/303
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |