US3950601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace
Assignee: Individual
•
Filing: 1974-05-23
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Granted: 1976-04-13
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Expires: 1994-05-23
Abstract
Abstract An electric furnace for the melting of metallic and non-metallic charge, comprising an annular hearth which houses the electrodes connected to a power supply. The central zone of the furnace can accommodate the spouts for discharging the melt, supports with electrode holders, furnace transformers or gas cleaning devices.
Inventors
- 👤 Alexandr Nikolaevich Popov
- 👤 Leonid Savvich Katsevich
- 👤 Vladimir Lvovich Rozenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:12
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/18; F; F27; F27D; F27D11/00; H05B3/00; H05B3/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
An electric furnace for the melting of metallic and non-metallic charge comprising: an annular hearth in which the charge is placed, an annular furnace roof, and a plurality of electrodes passing through said roof and arranged in said hearth, a power supply source to which said electrodes are connected, and means for causing relative circular movement between said annular hearth and said plurality of electrodes about an axis of said annular hearth.
Claim 2
Dependent Claim
72 words
An electric furnace for the melting of metallic and non-metallic charge comprising: an annular hearth in which the charge is placed, an annular furnace roof, and a plurality of electrodes passing through said roof and arranged in said hearth, a power supply source to which said electrodes are connected, and means for causing relative circular movement between said annular hearth and said plurality of electrodes about an axis of said annular hearth.
Claim 3
Dependent Claim
22 words
An electric furnace as claimed in claim 1, in which said hearth has a working chamber of trapezoidal cross section diverging upwards.
Claim 4
Dependent Claim
41 words
An electric furnace as claimed in claim 2, in which the inner hearth wall is fitted with tapping holes for discharging the molten charge, with spouts on the tapping holes being directed radially inwards into the central zone of the furnace.
Claim 5
Dependent Claim
24 words
An electric furnace as claimed in claim 3, having a central zone inside the annular hearth, the zone housing electrode holders and supports therefor.
Claim 6
Dependent Claim
32 words
An electric furnace as claimed in claim 4, in which said supports together with said electrode holders are mounted on a bed-plate equipped with a drive to rotate it about vertical axis.
Claim 7
Dependent Claim
29 words
An electric furnace as claimed in claim 4, wherein said power supply source comprises furnace transformers coupled to said electrode holders which transformers are located in said central zone.
Claim 8
Dependent Claim
27 words
An electric furnace as claimed in claim 1, with a central zone in the center of the annular hearth,, the zone including gas cleaning devices accommodated therein.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |