US2939580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic ore separator
Assignee: Individual
•
Filing: 1957-05-27
•
Granted: 1960-06-07
•
Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Carpenter James Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/10; B03C1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1529970A
Cited
US1934742A
Cited
US2258194A
Cited
US2290892A
Cited
GB742932A
Cited
US2748940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |