US PATENT SUBCLASS 266 / 210
.~.~.~.~ Recirculating material to its source

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  DF  .~.~.~ By upward flow of metal within treating zone {1}
210.~.~.~.~ Recirculating material to its source

DEFINITION

Classification: 266/210

(under subclass 209) Device wherein the metal is returned from the reduced pressure zone to its point of origin.