US PATENT SUBCLASS 52 / 220.4
.~.~ Corrugated type

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  DF  .~ Multiple passageway or multicellular load-bearing units (e.g., grid or two parallel pipes in a slab) {1}
220.4.~.~ Corrugated type

DEFINITION

Classification: 52/220.4

Corrugated type:

(under subclass 220.3) Unit in which the paths are defined by alternating parallel ridges and grooves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

783.11+, for a corrugated sheet.