US PATENT SUBCLASS 432 / 250
.~ Door, cover or port


Current as of: June, 1999
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432 /   HD   HEATING

247  DF  HEATING OR HEAT RETAINING WORK CHAMBER STRUCTURE {5}
250.~ Door, cover or port


DEFINITION

Classification: 432/250

(under subclass 247) Apparatus including structure defining (1) a feed or access opening of a work chamber or (2) a removable cover for such opening.

SEE OR SEARCH THIS CLASS, SUBCLASS:

64, for a heater having a fluid curtain at a chamber port or work path.

65, for a heat shield or fume collector at a furnace chamber access area.

73, for a combustion products flue or generator and a work chamber mounted for relative movement for access.

237, for a protectively cooled door, cover, door frame, or rim of a cover of a heating furnace.

242, for a closure or seal for an entrance passage through which a feeding means causes work to move.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids,

242, for a chamber seal in a gas-solid contact device.

49, Movable or Removable Closures, appropriate subclass for a movable or removable closure of general utility.

110, Furnaces,

173+, for a door, and subclass 181 for a door easing or arch, usable in either a heating or solid fuel combustion furnace.

126, Stoves and Furnaces,

190+, for door structure applicable to a cooking or direct heat radiating heating stove.