(under subclass 109) Subject matter including circuitry for regulating the furnace operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
12, for electron beam vaporizing furnace power supply and control circuits.
25, for plasma furnaces control systems.
40, for glass furnace electrical system regulation.
49+, for electroslag remelting furnaces with power supply control.
70, and 104+, for arc furnace power regulation.
148, for induction furnace power supply regulation. SEE OR SEARCH CLASS
219, Electric Heating,
482+, for heating devices with power supply and voltage, or current regulation, or current control means.
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses for systems for supplying electric current to arc furnace provided that the arc furnace is only nominally disclosed.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
365+, for miscellaneous gating circuits, subclasses 509+ for miscellaneous externally effected circuits, subclasses 518+ for miscellaneous control circuits, and subclasses 538+ for miscellaneous bias circuits with regulating.
