US2847169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding charge for ball mills
Assignee: Individual
•
Filing: 1955-11-25
•
Granted: 1958-08-12
•
Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Hartman William Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:17
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/18; B02C17/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1393334A
Cited
DE440198C
Cited
US1331964A
Cited
GB274786A
Cited
US1720024A
Cited
GB425023A
Cited
GB471180A
Cited
US2431870A
Cited
DE866894C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |