Patent US4446376A successfully refreshed from Google Patents.
US2931584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball mill
Assignee: Individual
•
Filing: 1956-04-09
•
Granted: 1960-04-05
•
Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 Donald H Fairchild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:32
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US688229A
Cited
US1460008A
Cited
US1741604A
Cited
US1898187A
Cited
GB427671A
Cited
US2118628A
Cited
US2268661A
Cited
US2560972A
Cited
US2815940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |