US PATENT SUBCLASS 138 / 176
.~.~.~ Reinforcement under tension

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

172  DF  REINFORCED {2}
174  DF  .~ With embedded element {1}
175  DF  .~.~ Clay, concrete or masonry {1}
176.~.~.~ Reinforcement under tension

DEFINITION

Classification: 138/176

(under subclass 175) Device wherein the reinforcement is tensioned to prestress the clay, concrete or masonry.