Patent US223901A successfully refreshed from Google Patents.
US223901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic qrain-separatok
Assignee: —
•
Filing: —
•
Granted: 1880-01-27
•
Expires: 1897-01-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:14
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/10; B03C1/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1883-01-26 | 1883-07-28 | 1884-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1887-01-26 | 1887-07-28 | 1888-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1891-01-26 | 1891-07-28 | 1892-01-27 | $7700.00 | Window Closed / Lapsed |