US PATENT SUBCLASS 220 / 203.14
.~.~.~.~.~ Flexible opening in stopper

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
202  DF  .~ With condition responsive vent or valve {1}
203.01  DF  .~.~ Responsive to pressure {10}
203.11  DF  .~.~.~ Flexible, resilient vent closing member {4}
203.13  DF  .~.~.~.~ Stopper-type vent closure {1}
203.14.~.~.~.~.~ Flexible opening in stopper

DEFINITION

Classification: 220/203.14

Flexible opening in stopper:

(under subclass 203.13) Device wherein said flexible plug engaged in a vent opening in the closure deforms in response to pressure in order to open passageways through the plug to relieve pressure.