US2442522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic classifier employing vertical and vortical currents
Assignee: OREFRACTION Inc
•
Filing: 1944-12-16
•
Granted: 1948-06-01
•
Expires: 1964-12-16
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:18
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/62; B03B5/66
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |