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Class Information
Number: 373/108
Name: Industrial electric heating furnaces > Arc furnace device > Power supply system > D.c. power
Description: Subject matter wherein the electric power is supplied by direct current.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8217312 Method and device for heating a fluid Jul. 10, 2012
8110019 Modified induction furnace and process for removing zinc-containing metallurgical waste, with recovery of the metals therefrom Feb. 7, 2012
7295593 System and method of minimizing loss of electrical conduction during input of feed material to a furnace Nov. 13, 2007
7212561 System and method for controlling electrical power across multiple furnaces using variable reactors May. 1, 2007
6693947 Method to protect the anode bottoms in batch DC electric arc furnace steel production Feb. 17, 2004
6490312 Direct-current arc furnace comprising a centric charging shaft for producing steel and a method therefor Dec. 3, 2002
6466605 Concentric electrode DC arc system and their use in processing waste materials Oct. 15, 2002
6421366 Method and device for supplying an electric arc melting furnace with current Jul. 16, 2002
6192065 Method and apparatus for controlling arcing in a DC arc furnace Feb. 20, 2001
6034985 Remelting method for recognition and recovery of noble metals and rare earths Mar. 7, 2000
6026113 Method for the electromagnetic stirring of the liquid metal in electric arc furnaces and relative device Feb. 15, 2000
5991327 Smart predictive line controller for AC and DC electric arc furnaces Nov. 23, 1999
5956366 Arc furnace and method in which molten material is stirred and the arc is guided Sep. 21, 1999
5900209 Plant for producing metal melts May. 4, 1999
5889809 Cooling system for electrodes in D.C. electric arc furnaces Mar. 30, 1999
5867523 Electric furnace with conductive hearth Feb. 2, 1999
5844933 Electrode arrangement for direct current and furnace Dec. 1, 1998
5809054 Method for stabilizing an AC system against reactive-load fluctuations, and a power-factor correction device Sep. 15, 1998
5809055 Metallurgical vessel heated by direct current and having a bottom electrode Sep. 15, 1998
5787109 Furnace vessel for a DC arc furnace Jul. 28, 1998
5748666 Method and furnace for treatment of ash May. 5, 1998
5737355 Directly induced swing for closed loop control of electroslag remelting furnace Apr. 7, 1998
5708677 Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting Jan. 13, 1998
5694413 Procedure and apparatus for continuous supply of heat in electrically conductive bulk goods Dec. 2, 1997
5651024 Cooled bottom electrode for a direct current electric furnace Jul. 22, 1997
5629879 Control device for the actuation of switchgears according to a time program May. 13, 1997
5617447 Method of stabilizing a power supply network against reactive load fluctuations, and a reactive power compensation device Apr. 1, 1997
5610937 Regulation method for a DC arc furnace Mar. 11, 1997
5590152 DC arc furnace Dec. 31, 1996
5590151 Process for melting scrap iron in an electric furnace and installation for implementing the process Dec. 31, 1996
5588018 Metallurgical container comprising a hearth bottom electrode Dec. 24, 1996
5583883 Electric arc-furnace stabilization using voltage pulse injection Dec. 10, 1996
5533044 Method of electrode regulation of a DC arc furnace and electrode regulation device Jul. 2, 1996
5526374 Direct current electric arc furnace Jun. 11, 1996
5490163 Method of operation of a D.C. electric-arc furnace with bottom electrode and refractory part for its implementation Feb. 6, 1996
5479433 Direct current arc furnace Dec. 26, 1995
5479435 DC arc furnace Dec. 26, 1995
5463653 Power converter device for direct current power supply to an electric arc furnace Oct. 31, 1995
5438588 Direct current-electric arc furnace system Aug. 1, 1995
5410564 Direct current electric furnace for melting metal Apr. 25, 1995
5383218 Direct current melting furnace with control of deflection of the electric age Jan. 17, 1995
5381440 Bottom electrode for direct current arc furnaces Jan. 10, 1995
5381441 Direct current arc furnace and method for its operation Jan. 10, 1995
5371759 D.C. furnace with a hearth electrode, hearth electrode and electrode block, as well as process for operating said furnace Dec. 6, 1994
5365542 Anode for a direct current arc furnaces Nov. 15, 1994
5351267 Process for electrode control of a DC arc furnace, and an electrode control device Sep. 27, 1994
5331661 Method and apparatus for controlling electroslag remelting Jul. 19, 1994
5323417 Metallurgical vessel for direct-current arc equipment Jun. 21, 1994
5317592 Direct resistance heating electrical furnace assembly and method of operating same May. 31, 1994
5317591 Direct-current arc furnace May. 31, 1994

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