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Patent US4200452A successfully refreshed from Google Patents.
US4200452A
Expired / Lapsed
US
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Method for the refining of iron-based melts
Assignee: KOMETECH Ltd
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Filing: 1978-06-29
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Granted: 1980-04-29
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Expires: 1998-06-29
Abstract
Abstract A method of and an apparatus for the refining of a ferrous melt makes use of a ladle with a removable cover provided with a porous plug at its bottom through which an inert gas is introduced. A direct current source is connected to a carbon electrode in contact with the melt and at least one electrode above the melt.
Inventors
- 👤 Peter H. Savov
- 👤 Vassil G. Peev
- 👤 Alexander Y. Valchev
- 👤 Nikola A. Lingorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:49
CPC Classifications
B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; C; C21; C21C; C21C7/00; C21C7/0075; C21C7/04; C21C7/064; C21C7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A method of refining a ferrous melt, comprising the steps of: (a) introducing the ferrous melt into a ladle; (b) applying and sealing a cover to said ladle; (c) introducing a stirring gas into the melt in said ladle through a porous plug in the base of said ladle; (d) heating the melt in said ladle by passing a direct electric current through said melt between two electrodes in contact therewith and by additionally generating an arc with direct current between another electrode spaced from above the melt; and (e) introducing a gas into said melt through at least one of said electrodes.
Claim 2
Independent Claim
103 words
A method of refining a ferrous melt, comprising the steps of: (a) introducing the ferrous melt into a ladle; (b) applying and sealing a cover to said ladle; (c) introducing a stirring gas into the melt in said ladle through a porous plug in the base of said ladle; (d) heating the melt in said ladle by passing a direct electric current through said melt between two electrodes in contact therewith and by additionally generating an arc with direct current between another electrode spaced from above the melt; and (e) introducing a gas into said melt through at least one of said electrodes.
Claim 3
Dependent Claim
23 words
The method defined in claim 1, further comprising the step of evacuating the ladle above said melt through an opening in said cover.
Claim 4
Dependent Claim
19 words
The method defined in claim 1, further comprising the step of introducing oxygen into said melt through said cover.
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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |