Patent US1966791A successfully refreshed from Google Patents.
Patent US3158464A successfully refreshed from Google Patents.
US3158464A
Expired / Lapsed
US
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Ferrochromium production
Assignee: Elkem Metals Co LP
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Filing: 1963-05-23
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Granted: 1964-11-24
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Expires: 1983-05-23
Abstract
No abstract record available.
Inventors
- 👤 Chynoweth William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:47
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE PRODUCTION OF FERROCHROMIUM ALLOYS WHICH COMPRISES SMELTING OXIDIC CHROME ORE WITH CARBONACEOUS MATERIAL AND SILICA, IN THE ABSENCE OF ADDITIONAL LIME, IN A METALLURGICAL FURNACE, TO PRODUCE A MOLTEN HIGH-SILICON, LOW SULFUR INTERMEDIATE FERRCHROMIUM ALLOY AND A DISCARD SLAG; TAPPING SAID MOLTEN INTERMEDIATE FERROCHROME ALLOY INTO A LADLE AT A TAPPING TEMPERATURE OF BETWEEN 1500*C. AND 1600*C.; AND CONTACTING THE TAPPED MOLTEN METAL WITH OXIDIC CHROMIUM ORE AND TREATING THE TAPPED MOLTEN METAL WITH GASEOUS OXYGEN AT A RATE SUCH THAT THE TEMPERATURE OF THE METAL DOES NOT EXCEED 1760*C. TO PRODUCE A LOW-SILICON, LOW-SULFUR, FERROCHROMIUM ALLOY AND A RE-CYCLABLE CHROMIUM-RICH SLAG.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE PRODUCTION OF FERROCHROMIUM ALLOYS WHICH COMPRISES SMELTING OXIDIC CHROME ORE WITH CARBONACEOUS MATERIAL AND SILICA, IN THE ABSENCE OF ADDITIONAL LIME, IN A METALLURGICAL FURNACE, TO PRODUCE A MOLTEN HIGH-SILICON, LOW SULFUR INTERMEDIATE FERRCHROMIUM ALLOY AND A DISCARD SLAG; TAPPING SAID MOLTEN INTERMEDIATE FERROCHROME ALLOY INTO A LADLE AT A TAPPING TEMPERATURE OF BETWEEN 1500*C. AND 1600*C.; AND CONTACTING THE TAPPED MOLTEN METAL WITH OXIDIC CHROMIUM ORE AND TREATING THE TAPPED MOLTEN METAL WITH GASEOUS OXYGEN AT A RATE SUCH THAT THE TEMPERATURE OF THE METAL DOES NOT EXCEED 1760*C. TO PRODUCE A LOW-SILICON, LOW-SULFUR, FERROCHROMIUM ALLOY AND A RE-CYCLABLE CHROMIUM-RICH SLAG.
References Cited (Backward Citations)
GB159568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |