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Class Information
Number: 373/5
Name: Industrial electric heating furnaces > Plural diverse heating means > Resistance
Description: Subject matter wherein one of the heating elements is a means to develop heat by the passage of current through a material, or device having the property of electrical resistance.

Sub-classes under this class:

Class Number Class Name Patents
373/6 With induction 5

Patents under this class:

Patent Number Title Of Patent Date Issued
6807220 Retention mechanism for heating coil of high temperature diffusion furnace Oct. 19, 2004
6160836 Electro-smokeless extraction/recovery system Dec. 12, 2000
6144688 Heat furnace having complimentary electric heating Nov. 7, 2000
6061383 Method and apparatus for tuning polychlorinated biphenyl to harmless May. 9, 2000
6061384 Process and apparatus for the production of activated carbon May. 9, 2000
6038247 Graphitizing electric furnace Mar. 14, 2000
5883919 Diffusion furnace system for preventing gas leakage Mar. 16, 1999
4425092 System for burning fine-grained material, particularly for the manufacture of cement clinkers Jan. 10, 1984
4406618 Method of operating continuous heat treatment furnace for metal strip coils Sep. 27, 1983
4392822 System for burning fine-grained material, particularly for the manufacture of cement clinkers Jul. 12, 1983
4294603 Glass forehearth construction Oct. 13, 1981
4248408 Method and apparatus for reducing particulate iron oxide to molten iron with solid reductant and oxy-fuel burners Feb. 3, 1981
4124199 Process and apparatus for case hardening of ferrous metal work pieces Nov. 7, 1978
4113977 Preheating system with gas recirculation Sep. 12, 1978
4093816 Furnace heating apparatus Jun. 6, 1978
4029489 Method of and apparatus for melting of glass Jun. 14, 1977

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