US PATENT SUBCLASS 52 / 302.3
.~ With the vent or drain entirely along at least one substantial dimension (e.g., length, not thickness)

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

302.1  DF  WALL, CEILING, FLOOR, OR ROOF DESIGNED FOR VENTILATION OR DRAINAGE {5}
302.3.~ With the vent or drain entirely along at least one substantial dimension (e.g., length, not thickness) {1}
302.4  DF  .~.~> Composed of interfitting blocks

DEFINITION

Classification: 52/302.3

With the vent or drain entirely along at least one substantial dimension (e.g., length, not thickness):

(under subclass 302.1) Wall, ceiling, floor, or roof comprising a distinct cavity, space, chamber, channel, groove, or other three dimensional hollow-type area through which a liquid or gas flows to be discharged.

SEE OR SEARCH THIS CLASS, SUBCLASS:

263, for a three-way corner construction on a column (e.g., elevated floor).

SEE OR SEARCH CLASS

165, Heat Exchange,

47+, for a structural installation.

454, Ventilation,

254+, for devices allowing the flow of air in a building.