US PATENT SUBCLASS 138 / 172
REINFORCED


Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

172REINFORCED {2}
173  DF  .~> Corrugated
174  DF  .~> With embedded element {1}


DEFINITION

Classification: 138/172

(under the class definition) Device wherein the wall structure of the pipe is reinforced either by the shape of the wall or by at least one element applied to said wall.

SEE OR SEARCH THIS CLASS, SUBCLASS:

153, for a pipe having more than one layer in the pipe wall make-up, one of said layers being reinforced.