US2921680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore concentrating apparatus
Assignee: Individual
•
Filing: 1955-10-31
•
Granted: 1960-01-19
•
Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Kreta John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:02
CPC Classifications
B; B03; B03B; B03B4/00; B03B4/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US349504A
Cited
US2738071A
Cited
US869860A
Cited
US1053367A
Cited
US882511A
Cited
US1006293A
Cited
US1245611A
Cited
US1219128A
Cited
US1276529A
Cited
US1385693A
Cited
US2582302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |