US PATENT SUBCLASS 220 / 371
.~.~ With filter

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
367.1  DF  .~ Vent in closure {4}
371.~.~ With filter {1}
372  DF  .~.~.~> Screen

DEFINITION

Classification: 220/371

(under subclass 367.1) Device wherein the vent means is provided with filtering means permitting the passage therethrough of vapors, such as gases, steam, or air, while preventing the passage of liquids.