US PATENT SUBCLASS 220 / 203.11
.~.~.~ Flexible, resilient vent closing member

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.~.~.~ Flexible, resilient vent closing member {4}
203.12  DF  .~.~.~.~> Flexible, ringlike vent closing member (e.g., O-ring)
203.13  DF  .~.~.~.~> Stopper-type vent closure {1}
203.15  DF  .~.~.~.~> Resilient sheetlike member retains separate vent closure
203.16  DF  .~.~.~.~> Resilient sheetlike member closes vent opening {2}

DEFINITION

Classification: 220/203.11

Flexible, resilient vent closing member:

(under subclass 203.01) Device wherein the vent or valve comprises a deformable member yielding in response to a changing pressure within a receptacle.