US PATENT SUBCLASS 266 / 197
.~.~ Shaft-type furnace, e.g., blast furnace

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}
197.~.~ Shaft-type furnace, e.g., blast furnace {2}
198  DF  .~.~.~> Having external support
199  DF  .~.~.~> Having specific top structure

DEFINITION

Classification: 266/197

(under subclass 171) Device comprising a chamber having a substantially vertical axis to which material is fed at an elevated level for gravitation downwardly across a heating surface or through a heating medium.

SEE OR SEARCH CLASS

432, Heating,

95+, for shaft-type furnaces of general utility.