US4016355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device in direct current arc furnaces
Assignee: ABB Norden Holding AB
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Filing: 1975-07-10
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Granted: 1977-04-05
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Expires: 1995-07-10
Abstract
Abstract The present invention relates to a device in direct current arc furnaces with a furnace vessel and at least one arcing electrode (cathode) and at least one contact electrode. The number of cathodes and/or contact electrodes (for example hearth connections - anodes) may be one, two or more.
Inventors
- 👤 Sven-Einar Stenkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:39
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; F; F27; F27D; F27D11/00; F27D11/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A DC electric arc furnace comprising a furnace enclosure having a hearth for containing a melt, said hearth having a contact electrode for the melt, an arcing electrode positioned above the melt for forming an arc with the melt when placed in circuit therewith via said electrode, said arcing and contact electrodes being relatively offset in a horizontal direction so that the arc is normally angularly deflected with respect to a vertical direction, and means for applying a magnetic field to the arc so as to control its arcing direction.
Claim 2
Dependent Claim
90 words
A DC electric arc furnace comprising a furnace enclosure having a hearth for containing a melt, said hearth having a contact electrode for the melt, an arcing electrode positioned above the melt for forming an arc with the melt when placed in circuit therewith via said electrode, said arcing and contact electrodes being relatively offset in a horizontal direction so that the arc is normally angularly deflected with respect to a vertical direction, and means for applying a magnetic field to the arc so as to control its arcing direction.
Claim 3
Dependent Claim
36 words
The furnace of claim 1 in which said means comprises at least one magnetic core having at least one electrically energized magnetizing coil, the core being positioned below said hearth and the hearth itself being non-magnetic.
Claim 4
Dependent Claim
26 words
The furnace of claim 2 in which said core is positioned to form a magnetic field substantially perpendicular to the arc formed by said arcing electrode.
Claim 5
Dependent Claim
27 words
The furnace of claim 3 in which a second core forms a cross with said one core and also has at least one electrically energized magnetizing coil.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |