US PATENT SUBCLASS 220 / 373
.~.~ With means to prevent escape of contents through vent

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
367.1  DF  .~ Vent in closure {4}
373.~.~ With means to prevent escape of contents through vent {1}
374  DF  .~.~.~> Tortuous passage

DEFINITION

Classification: 220/373

(under subclass 367.1) Device wherein the closure or vent is provided with means to prevent the receptacle contents from escaping through the vent or opening.