US PATENT SUBCLASS 220 / 609
.~.~.~ Pressure responsive contour

Current as of: June, 1999
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220 /   HD   RECEPTACLES

600  DF  END WALL STRUCTURE {8}
604  DF  .~ One-piece side and end wall {3}
608  DF  .~.~ Contoured end wall (e.g., curved, corrugated, ribbed, etc.) {1}
609.~.~.~ Pressure responsive contour

DEFINITION

Classification: 220/609

Pressure responsive contour:

(under subclass 608) Receptacle wherein the contoured end wall structure is designed to move outwardly under high internal pressure or inwardly in response to relatively low internal pressure (e.g., vacuum) conditions within the receptacle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

624, for similar subject matter wherein the sidewall and end wall are not of one-piece construction.