US PATENT SUBCLASS 52 / 220.3
.~ Multiple passageway or multicellular load-bearing units (e.g., grid or two parallel pipes in a slab)

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

220.1  DF  WALL, CEILING, OR FLOOR DESIGNED FOR UTILITIES {6}
220.3.~ Multiple passageway or multicellular load-bearing units (e.g., grid or two parallel pipes in a slab) {1}
220.4  DF  .~.~> Corrugated type

DEFINITION

Classification: 52/220.3

Multiple passageway or multicellular load-bearing units (e.g., grid or two parallel pipes in a slab):

(under subclass 220.1) Unit containing (1) two parallel duct-type paths or (2) a network of uniformly arranged horizontal and perpendicular spaces.