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Class Information
Number: 373/109
Name: Industrial electric heating furnaces > Resistance furnace device
Description: Subject matter including electrical resistance means as the heating element.

Sub-classes under this class:

Class Number Class Name Patents
373/115 Charging or discharging 40
373/135 Control 31
373/113 For cooling 28
373/116 For manipulation of the charge or melt (e.g., stirring) 21
373/137 Lining 82
373/117 With heating element detail 58
373/110 With internal atmosphere control (e.g., pressure, vacuum, etc.) 52

Patents under this class:
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Patent Number Title Of Patent Date Issued
7792177 Method and furnace for electrical calcination enabling utilization of volatile matters Sep. 7, 2010
7012947 Arrangement for fastening heating elements to a furnace Mar. 14, 2006
6993060 Resistor made from carbonaceous material Jan. 31, 2006
6947467 Cooling system for heat treating furnace Sep. 20, 2005
6700918 Electric furnace for the production of metal oxides Mar. 2, 2004
6608856 Crucible melting furnace Aug. 19, 2003
6529544 Vacuum heat treating furnace Mar. 4, 2003
6307874 Expansion loops for heating elements in vacuum furnaces Oct. 23, 2001
6157004 Electric heating or preheating furnace particularly for lining cylinders and/or for firing metal-ceramic Dec. 5, 2000
6125658 Glass furnace and installation comprising same Oct. 3, 2000
6061384 Process and apparatus for the production of activated carbon May. 9, 2000
6031207 Sintering kiln Feb. 29, 2000
5946342 Process and apparatus for the production of activated carbon Aug. 31, 1999
5946341 Method pertaining to the operation of electric furnaces, and a furnace Aug. 31, 1999
5881090 Quartz used in semiconductor manufacturing device, apparatus for manufacturing the quartz, and method for manufacturing the same Mar. 9, 1999
5835525 Furnaces and linings having segments with surfaces configured to absorb and reradiate heat Nov. 10, 1998
5703901 Calcination furnace Dec. 30, 1997
5665302 Method and equipment for bringing metal alloy ingots, billets and the like to the semisolid or semiliquid state in readiness for thixotropic forming Sep. 9, 1997
5579334 Method and apparatus for reacting solid particulate reagents in an electric furnace Nov. 26, 1996
5559826 Calcination furnace Sep. 24, 1996
5517001 High performance horizontal diffusion furnace system May. 14, 1996
5501159 Method of controlling hydrocarbon release rate by maintaining target oxygen concentration in discharge gases Mar. 26, 1996
5502742 Heat treating furnace with removable floor, adjustable heating element support, and threaded ceramic gas injection nozzle Mar. 26, 1996
5498852 Oval top loading kiln having removable shelves Mar. 12, 1996
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
5432319 Furnace for heat treatment of dental products in an inert atmosphere Jul. 11, 1995
5420394 Casing and heater configuration in a material processing apparatus May. 30, 1995
5406582 Apparatus and process for activation and reactivation of carbon by electrical resistance heating in the presence of steam Apr. 11, 1995
5405264 Device for carrying a charge in a furnace Apr. 11, 1995
5353719 Apparatus and method for controlled processing of materials Oct. 11, 1994
5327454 Bridge for connecting cores in a manufacturing equipment of polycrystal silicon Jul. 5, 1994
5317592 Direct resistance heating electrical furnace assembly and method of operating same May. 31, 1994
5289787 Multiple unit material processing apparatus Mar. 1, 1994
5287383 Method and apparatus for producing active carbon using carbon-containing material Feb. 15, 1994
5283804 Process and apparatus for graphitizing carbon bodies Feb. 1, 1994
5251231 Vacuum furnace Oct. 5, 1993
5222074 Thermal decomposition cell Jun. 22, 1993
5206880 Furnace having tubes for cracking hydrocarbons Apr. 27, 1993
5200975 Furnace for viscoelasticity measuring device with concentric gas cooling shield Apr. 6, 1993
5193100 Apparatus for detecting gaseous discharge in vacuum furnaces Mar. 9, 1993
5190901 Method for producing active carbon using carbon-containing material Mar. 2, 1993
5173921 Apparatus and process for activation of carbon by electrical resistance heating in the presence of steam Dec. 22, 1992
4966624 Method and apparatus for electric refining of lead Oct. 30, 1990
4668287 Process for producing high purity zirconium and hafnium May. 26, 1987
4663763 Charge-load support for a glow discharge furnace May. 5, 1987
4606037 Apparatus for manufacturing semiconductor single crystal Aug. 12, 1986
4543124 Apparatus for continuous steelmaking Sep. 24, 1985
4509179 Vacuum sintering and hot isostatic pressing in the same vessel Apr. 2, 1985
4362501 Process and arrangement for the zonal heating or cooling of elongate treatment members Dec. 7, 1982
4347431 Diffusion furnace Aug. 31, 1982

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