Patent US2624398A successfully refreshed from Google Patents.
US4390773A
Expired / Lapsed
US
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Contact electrode for melting and heating furnaces with DC plasma heating
Assignee: VEB EDELSTAHLWERK 8 AN EAST GERMAN Co
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Filing: 1981-02-05
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Granted: 1983-06-28
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Expires: 2001-02-05
Abstract
Abstract The invention relates to a metallurgical plasma melting furnace used for the melting of metals and alloys wherein at least one auxiliary start-up burner for liquid or gaseous fuels is so arranged adjacent to each plasma burner that the hot combustion gases enter into the plasma melting furnace through the same opening in the sidewall of the furnace vessel and melt a crater into the charge material in front of the plasma burner. After the crater has reached a sufficient size, the plasma burners can be reliably operated industrially.
Inventors
- 👤 Fred Esser
- 👤 Detlev Klopper
- 👤 Walter Lachner
- 👤 Gerhard Scharf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:50
CPC Classifications
H; H05; H05B; H05B7/00; C; C21; C21B; C21B13/00; C21B13/12; C21B13/125; C21C; C21C5/00; C21C5/52; C21C5/5205; C21C5/5229; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/226; F; F27; F27B; F27B3/00; F27B3/08; F27D; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0031; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
In a metallurgical plasma melting furnace for the melting of metals and alloys, having at least one plasma burner having a longitudinal axis mounted in a furnace sidewall port, the improvement comprising at least one start-up burner having a longitudinal axis for each of said at least one plasma burners, the start-up burner mounted in the same port as its associated plasma burner and alongside same with said longitudinal axes of the start-up burner and associated plasma burner intersecting within the furnace and forming an acute angle at the point of intersection.
Claim 2
Dependent Claim
92 words
In a metallurgical plasma melting furnace for the melting of metals and alloys, having at least one plasma burner having a longitudinal axis mounted in a furnace sidewall port, the improvement comprising at least one start-up burner having a longitudinal axis for each of said at least one plasma burners, the start-up burner mounted in the same port as its associated plasma burner and alongside same with said longitudinal axes of the start-up burner and associated plasma burner intersecting within the furnace and forming an acute angle at the point of intersection.
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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |