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Class Information
Number: 373/123
Name: Industrial electric heating furnaces > Resistance furnace device > With heating element detail > Open circuit (e.g., charge internal resistance heating) > With preheating
Description: Subject matter including means to preheat the principal heating means of the furnace to a temperature for rendering the heating means electrically conductive.

Sub-classes under this class:

Class Number Class Name Patents
373/124 Including starting resistor 2

Patents under this class:

Patent Number Title Of Patent Date Issued
5751759 Pre-heating furnace for baked amorphous carbon bodies May. 12, 1998
5265118 Silicon carbide whisker production apparatus Nov. 23, 1993
4635273 Method and apparatus for the thermal production of metal carbides and metals Jan. 6, 1987
4439145 Aluminum furnace and preheater therefor Mar. 27, 1984
4407666 Methods for prolonging the useful life of a graphite element in an optical fiber-drawing furnace Oct. 4, 1983

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