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Class Information
Number: 373/2
Name: Industrial electric heating furnaces > Plural diverse heating means > Arc
Description: Subject matter wherein one of the heating elements is an electric arc between two electrodes, or between an electrode and a current carrying material (e.g., the charge material).

Sub-classes under this class:

Class Number Class Name Patents
373/4 With induction 7
373/3 With resistance 6

Patents under this class:

Patent Number Title Of Patent Date Issued
8240169 Vitreous silica crucible manufacturing apparatus Aug. 14, 2012
7447250 Electrostatic suspension furnace and method for fusing samples using this Nov. 4, 2008
7061964 Electrostatic levitation furnance Jun. 13, 2006
6765949 Carbon nanostructures and methods of preparation Jul. 20, 2004
6466605 Concentric electrode DC arc system and their use in processing waste materials Oct. 15, 2002
6424672 Device for producing slag in an electric arc furnace Jul. 23, 2002
6400748 Method for operating an electric arc furnace to build up and maintain foamed slag Jun. 4, 2002
6289035 Mounting arrangement for auxiliary burner or lance Sep. 11, 2001
6175584 Aspiration system to reduce the losses of fine materials and powders from an electric arc furnace Jan. 16, 2001
6081545 ARC furnace improved fume collection Jun. 27, 2000
6038245 Process for melting a charge in an electrical arc furnace Mar. 14, 2000
5926498 Melting furnace for the thermal treatment of special waste materials containing heavy metal and/or dioxin Jul. 20, 1999
5896409 Fume intake and cooling device for electric arc furnaces Apr. 20, 1999
5822357 Process for melting a charge in a furnace Oct. 13, 1998
5802097 Melting method for an electric ARC furnace with alternative sources of energy and relative electric ARC furnace with special burner positioning Sep. 1, 1998
5734673 Waste-melting furnace and waste-melting method Mar. 31, 1998
5573573 Electric arc furnace arrangement for producing steel Nov. 12, 1996
5471495 Electric arc furnace arrangement for producing steel Nov. 28, 1995
5467365 Process for the recovery of lead arising especially from the active material of spent batteries, and electric furnace intended especially for the use of the process Nov. 14, 1995
5392312 Method and device for regulating the combustion air flow rate of a flue rate gas collection device of a metallurgical reactor, corresponding collection device and metallurgical reactor Feb. 21, 1995
5373530 Melting furnace with gas injection Dec. 13, 1994
5245627 Use of a radiating arc furnace for treating a dross containing a metal in order to recover this metal Sep. 14, 1993
5228052 Plasma ashing apparatus Jul. 13, 1993
5166950 Process and apparatus for melting a furnace charge Nov. 24, 1992
5117438 Method of operating a smelting unit and smelting unit for that method May. 26, 1992
5068860 Helical wiggler device with permanent magnets for application to free electron lasers Nov. 26, 1991
4965813 Combustion aiding apparatus for steel-making electric-arc-furnace Oct. 23, 1990
4827486 Process for increasing the energy input in electric arc furnaces May. 2, 1989
4804395 Electrode arrangement for lensing method Feb. 14, 1989
4755203 Optic fiber positioning for lensing method Jul. 5, 1988
4743283 Alternating current arc for lensing system and method of using same May. 10, 1988
4740989 Plant for producing steel from scrap Apr. 26, 1988
4730336 Oxy-fuel burner system Mar. 8, 1988
4706258 Scrap melting method Nov. 10, 1987
4646315 Arc furnace burner control method and apparatus Feb. 24, 1987
4569733 Method of treating rock to recover metal, oxygen, and water Feb. 11, 1986
4485476 Apparatus and process for preparing high temperature reaction products Nov. 27, 1984
4425092 System for burning fine-grained material, particularly for the manufacture of cement clinkers Jan. 10, 1984
4247732 Method and apparatus for electrically firing an iron blast furnace Jan. 27, 1981
4156102 Method for producing ferro-alloys May. 22, 1979
4133967 Two-stage electric arc - electroslag process and apparatus for continuous steelmaking Jan. 9, 1979
4077614 Steelmaking apparatus Mar. 7, 1978
4002465 Process for continuously heating and melting prereduced iron ores Jan. 11, 1977

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