US2820705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering metals from nonferrous metallurgical slags
Assignee: Individual
•
Filing: 1955-03-17
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Granted: 1958-01-21
•
Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 John P Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR RECOVERING METALS LESS ACTIVE THAN FERROUS IRON IN THE ELECTROMOTIVE SERIES FROM NON-FERROUS METALLURGICAL SLAGS CONTAINING REDUCIBLE COMPOUNDS OF SAID METALS, SAID PROCESS COMPRISING: ESTABLISHING A REDUCTION ZONE CONTAINING A MATRIX COMPRISING PIECES OF A REDUCING MATERIAL FOR SAID COMPOUNDS, MAINTAINING IN SAID ZONE A REDUCING CONDITION INDICATED BY AN ATMOSPHERE CONTAINING CARBON MONOXIDE AND CARBON DIOXIDE IN SUCH PROPORTIONS THAT LOG. CO/CO2 IS FROM -4 TO +2, MAINTAINING IN SAID ZONE A TEMPERATURE OF BETWEEN THE MELTING POINT OF THE SLAG AND 1450*C., PASSING THE SLAG IN THE MOLTEN STATE THROUGH AND IN CONTACT WITH THE MATRIX IN SAID ZONE FOR REDUCTION OF THE REDUCIBLE METAL COMPOUNDS PRESENT IN THE SLAG, WITHDRAWING THE TREATED MOLTEN SLAG FROM SAID ZONE AFTER SUBSTANTIAL REDUCTION OF SAID METAL COMPOUNDS HAS OCCURRED, AND SEPARATING THE METAL PRODUCT FROM THE WITHDRAWN SLAG.
Claim 2
Dependent Claim
141 words
A PROCESS FOR RECOVERING METALS LESS ACTIVE THAN FERROUS IRON IN THE ELECTROMOTIVE SERIES FROM NON-FERROUS METALLURGICAL SLAGS CONTAINING REDUCIBLE COMPOUNDS OF SAID METALS, SAID PROCESS COMPRISING: ESTABLISHING A REDUCTION ZONE CONTAINING A MATRIX COMPRISING PIECES OF A REDUCING MATERIAL FOR SAID COMPOUNDS, MAINTAINING IN SAID ZONE A REDUCING CONDITION INDICATED BY AN ATMOSPHERE CONTAINING CARBON MONOXIDE AND CARBON DIOXIDE IN SUCH PROPORTIONS THAT LOG. CO/CO2 IS FROM -4 TO +2, MAINTAINING IN SAID ZONE A TEMPERATURE OF BETWEEN THE MELTING POINT OF THE SLAG AND 1450*C., PASSING THE SLAG IN THE MOLTEN STATE THROUGH AND IN CONTACT WITH THE MATRIX IN SAID ZONE FOR REDUCTION OF THE REDUCIBLE METAL COMPOUNDS PRESENT IN THE SLAG, WITHDRAWING THE TREATED MOLTEN SLAG FROM SAID ZONE AFTER SUBSTANTIAL REDUCTION OF SAID METAL COMPOUNDS HAS OCCURRED, AND SEPARATING THE METAL PRODUCT FROM THE WITHDRAWN SLAG.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |