US PATENT SUBCLASS 138 / 174
.~ With embedded element

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

172  DF  REINFORCED {2}
174.~ With embedded element {1}
175  DF  .~.~> Clay, concrete or masonry {1}

DEFINITION

Classification: 138/174

(under subclass 172) Device wherein the pipe wall is reinforced by an embedded element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

146, for a tube that is coated on one side with a coating material that is different from the coating material on the other side of said tube.