US PATENT SUBCLASS 138 / 121
.~ Corrugated

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

118  DF  FLEXIBLE {8}
121.~ Corrugated {1}
122  DF  .~.~> Spirally

DEFINITION

Classification: 138/121

(under subclass 118) Device having folds or corrugations in the wall thereof.

SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles,

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