US PATENT SUBCLASS 432 / 237
.~ Door, cover, door frame or rim of cover

Current as of: June, 1999
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432 /   HD   HEATING

233  DF  HEATING APPARATUS ELEMENT HAVING PROTECTIVE COOLING STRUCTURE {4}
237.~ Door, cover, door frame or rim of cover

DEFINITION

Classification: 432/237

(under subclass 233) Apparatus in which the cooled element is a part of an opening, its cover, a work cover, or the joint of the cover to the heating structure e.g. door, cover, door frame, pot rim, etc.

SEE OR SEARCH CLASS

110, Furnaces,

180, for a solid fuel combustion furnace door kept cool by the circulation of steam or air therethrough.