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Patent US3635699A successfully refreshed from Google Patents.
US3635699A
Expired / Lapsed
US
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Method of producing sized particles of low-carbon ferrochromium
Assignee: Elkem Metals Co LP
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Filing: 1969-12-22
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Granted: 1972-01-18
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Expires: 1989-12-22
Abstract
Abstract Method for producing sized particles of high-purity low-carbon ferrochromium by heating under vacuum an agglomerated mixture of finely divided high-carbon ferrochromium, oxidized ferrochromium containing sufficient oxygen to react with the carbon in the high-carbon ferrochromium, and a slag-forming material such as silica whereby a reaction product is obtained comprising lowcarbon ferrochromium in a matrix of slag. The agglomerated reaction product thus produced is crushed and the crushed material given a leaching treatment to remove the slag constituent.
Inventors
- 👤 Cecil G Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
C; C22; C22C; C22C33/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A method in accordance with claim 1 wherein the amount of silica employed is from about 0.5 percent to 10 percent by weight of the reaction mixture.
Claim 2
Dependent Claim
26 words
A method in accordance with claim 1 wherein the silica is in an amount of from 3 to 6 percent by weight of the reaction mixture.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1 wherein the amount of silica is in an amount of about 4 percent by weight of the reaction mixture.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |