US PATENT SUBCLASS 220 / 203.13
.~.~.~.~ Stopper-type vent closure

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.~.~.~.~ Stopper-type vent closure {1}
203.14  DF  .~.~.~.~.~> Flexible opening in stopper

DEFINITION

Classification: 220/203.13

Stopper-type vent closure:

(under subclass 203.11) Device wherein said flexible member comprises a flexible plug engaged in a vent opening in the closure, said plug being deformable in response to pressure within or without a receptacle.