US Patent Class 373
INDUSTRIAL ELECTRIC HEATING FURNACES-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  PLURAL DIVERSE HEATING MEANS {3}
8  DF  ENVIRONMENTAL CONTROL {1}
10  DF  ELECTRON BEAM FURNACE DEVICE {4}
18  DF  PLASMA FURNACE DEVICE {3}
26  DF  GLOW DISCHARGE FURNACE DEVICE
27  DF  GLASS FURNACE DEVICE {2}
42  DF  ELECTROSLAG REMELTING DEVICE {7}
56  DF  WITH CONDENSATING DEVICE {2}
60  DF  ARC FURNACE DEVICE {9}
109  DF  RESISTANCE FURNACE DEVICE {7}
138  DF  INDUCTION FURNACE DEVICE {10}
166  DF  MISCELLANEOUS