US PATENT SUBCLASS 138 / 173
.~ Corrugated

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

172  DF  REINFORCED {2}
173.~ Corrugated

DEFINITION

Classification: 138/173

(under subclass 172) Device wherein the reinforcement is in the form of corrugations.

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121+, for corrugated flexible pipe.

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428, Stock Material or Miscellaneous Articles,

174+, for a single or plural layer stock material product embodying a nonplanar (e.g., corrugated, pleated) component.