US PATENT SUBCLASS 266 / 179
.~.~.~.~.~ With seal means

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

168  DF  MEANS FOR TREATING ORES OR FOR EXTRACTING METALS {3}
171  DF  .~ By means applying heat to work, e.g., furnace {10}
176  DF  .~.~ With means for moving solid material to or through heating zone {4}
177  DF  .~.~.~ By means for moving charge through zone {2}
178  DF  .~.~.~.~ Traveling grate {2}
179.~.~.~.~.~ With seal means

DEFINITION

Classification: 266/179

(under subclass 178) Device wherein means are provided at the junction between said mobile charge supporting surface and the heating means to prevent the ingress of atmospheric air into the heating zone or the escape of gas from the heating zone.