US2970689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal treating process
Assignee: Crucible Steel Company of America
•
Filing: 1958-03-27
•
Granted: 1961-02-07
•
Expires: 1978-03-27
Abstract
No abstract record available.
Inventors
- 👤 Melvin C Chang
- 👤 Dasher John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:11
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A METHOD FOR BENEFICATING MINERALS SLURRY WHICH COMPRISES PASSING SAID SLURRY THROUGH A PLURALITY OF SERIESCONNECTED SETS OF CYCLONE SEPARATORS, EACH OF SAID SETS COMPRISING A NUMBER OF PARALLEL-CONNECTED CYCLONES WITH THOSE IN ANOTHER SET WHEREBY THE UNDERFLOWS FROM THE RESPECTIVE SETS OF CYCLONES ARE IN DIFFERENT SIZE RANGES, SUBJECTING THE UNDERFLOWS FROM THE REPRESENT SETS OF CYCLONE SEPERATORS TO SEPERATE FORTH FLOTATION PROCESSES, AND COMBINING THE FORTH CONCENTRATES FROM THE SEPARATE FLOTATION PROCESSES.
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US2596407A
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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) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |