Patent US2909283A successfully refreshed from Google Patents.
US2909283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral concentrating and separating apparatus
Assignee: Ferros Metals Res Co Ltd
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Filing: 1957-01-23
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Granted: 1959-10-20
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Expires: 1977-01-23
Abstract
No abstract record available.
Inventors
- 👤 Duesling Clarence Lehi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:44
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/08; B04C5/103
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
MINERAL CONCENTRATING AND SEPARATING APPARATUS COMPRISING A CONCENTRATING CHAMBER OF CIRCULAR CROSSSECTION HAVING A TALLINGS SDISCHARGE OUTLET IN ITS TOP AND A CONCENTRATE DISCHARGE OUTLET IN ITS BOTTOM, SAID OUTLETS BEING DISPOSED IN AXIAL ALIGNMENT, AN INJECTOR HAVING A SPIRALLY DISPOSED PASSAGE FOR INTRODUCING MINERAL CONTAINING SLUDGE TO SAID CHAMBER IN A SUBSTANTIALLY CIRCULAR PATH WITHIN SAID CHAMBER, SAID PASSAGE AT A POINT INTERMEDIATE OF ITS EXTENT, GRADUALLY OPENING INTO SAID CHAMBER FROM ZERO OPENING TO FULL EXTENT AT THE TERMINAL END OF SAID PASSAGE AND GRADUALLY DECREASING IN DEPTH IN ITS FINAL EXTENT TO ZERO DEPTH AND MERGING WITH THE INTERIOR
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |