US PATENT SUBCLASS 220 / 670
.~.~ Corrugated

Current as of: June, 1999
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220 /   HD   RECEPTACLES

660  DF  SIDEWALL STRUCTURE {7}
669  DF  .~ Contoured sidewall (e.g., curved, corrugated, ribbed, variable thickness, etc.) {3}
670.~.~ Corrugated {3}
671  DF  .~.~.~> Axially extending only
672  DF  .~.~.~> Circumferentially extending only
673  DF  .~.~.~> Circumferentially and axially extending

DEFINITION

Classification: 220/670

Corrugated:

(under subclass 669) Receptacle wherein the contour is in the form of alternating grooves and ridges.