US PATENT SUBCLASS 266 / 209
.~.~.~ By upward flow of metal within treating zone

Current as of: June, 1999
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266 /   HD   METALLURGICAL APPARATUS

200  DF  MEANS FOR MELTING OR VAPORIZING METAL OR TREATING LIQUEFIED METAL {19}
207  DF  .~ By providing, treating or protecting environment, e.g., vacuum {1}
208  DF  .~.~ By application of vacuum {2}
209.~.~.~ By upward flow of metal within treating zone {1}
210  DF  .~.~.~.~> Recirculating material to its source

DEFINITION

Classification: 266/209

(under subclass 208) Device wherein an evacuated receptacle is provided with a downwardly extending supply passage within which the molten material is raised to a level higher than the level of the source.