US3257199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal reduction
Assignee: Reynolds Metals Co
•
Filing: 1963-07-19
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Granted: 1966-06-21
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:13
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/026; C22B; C22B21/00; C22B21/0038; C22B21/0053; C22B21/0061; C22B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM FROM OXIDIC ORES WHICH COMPRISES SUBJECTING A FURNACE FEED COMPRISING ALUMINA, SILICA, AND AN INTERMETALLIC COMPLEX TO REDUCTION IN THE PRESENCE OF A SUFFICIENT AMOUNT OF A CARBONACEOUS REDUCING AGENT UNTIL THE OXIDES ARE REDUCED TO THE METALLIC STATE AND A RAW ALLOY IS FORMED, TAPPING THE RESULTING RAW LIQUID ALLOY, COOLING THE RAW ALLOY TO A TEMPERATURE SUFFICIENT TO OBTAIN A LIQUID PHASE AND SOLID PHASES, SEPARATING THE RESULTING LIQUID PHASE CONSISTING OF PARTIALLY PURIFIED ALUMINUM-SILICON ALLOY FROM THE SOLID PHASES, TREATING THE PARTIALLY PURIFIED ALLOY WITH A METALLIC SOLVENT FOR ALUMINUM, SEPARATING THE ALUMINUM-METALLIC SOLVENT LIQUID PHASE FROM THE RESULTING SOLID PHASES AND RECOVERING THE ALUMINUM, SAID INTERMETALLIC COMPLEX CONSISTING OF SUBSTANTIALLY FULLY SATISFIED COMPLEXES OF ALUMINUM, SILCON AND AT LEAST ONE METAL SELECTED FROM THE CLASS CONSISTING OF IRON, AND TITANIUM, WHEREIN THE AMOUNT OF SAID FULLY SATISFIED INTERMETALLIC COMPLEXES ADDED TO THE FURNANCE FEED RANGES FROM 15-50 PERCENT BY WEIGHT OF THE TOTAL AMOUNT OF ALUMINA AND SILICA CHARGED AND THE WEIGHT RATIOS OF SAID ALUMINA AND SILICA ARE AS FOLLOWS:
Claim 2
Dependent Claim
182 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM FROM OXIDIC ORES WHICH COMPRISES SUBJECTING A FURNACE FEED COMPRISING ALUMINA, SILICA, AND AN INTERMETALLIC COMPLEX TO REDUCTION IN THE PRESENCE OF A SUFFICIENT AMOUNT OF A CARBONACEOUS REDUCING AGENT UNTIL THE OXIDES ARE REDUCED TO THE METALLIC STATE AND A RAW ALLOY IS FORMED, TAPPING THE RESULTING RAW LIQUID ALLOY, COOLING THE RAW ALLOY TO A TEMPERATURE SUFFICIENT TO OBTAIN A LIQUID PHASE AND SOLID PHASES, SEPARATING THE RESULTING LIQUID PHASE CONSISTING OF PARTIALLY PURIFIED ALUMINUM-SILICON ALLOY FROM THE SOLID PHASES, TREATING THE PARTIALLY PURIFIED ALLOY WITH A METALLIC SOLVENT FOR ALUMINUM, SEPARATING THE ALUMINUM-METALLIC SOLVENT LIQUID PHASE FROM THE RESULTING SOLID PHASES AND RECOVERING THE ALUMINUM, SAID INTERMETALLIC COMPLEX CONSISTING OF SUBSTANTIALLY FULLY SATISFIED COMPLEXES OF ALUMINUM, SILCON AND AT LEAST ONE METAL SELECTED FROM THE CLASS CONSISTING OF IRON, AND TITANIUM, WHEREIN THE AMOUNT OF SAID FULLY SATISFIED INTERMETALLIC COMPLEXES ADDED TO THE FURNANCE FEED RANGES FROM 15-50 PERCENT BY WEIGHT OF THE TOTAL AMOUNT OF ALUMINA AND SILICA CHARGED AND THE WEIGHT RATIOS OF SAID ALUMINA AND SILICA ARE AS FOLLOWS:
References Cited (Backward Citations)
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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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |