US PATENT SUBCLASS 141 / 299
.~.~ Concentric external vent

Current as of: June, 1999
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141 /   HD   FLUENT MATERIAL HANDLING, WITH RECEIVER OR RECEIVER COACTING MEANS

285  DF  MULTIPLE PASSAGE FILLING MEANS FOR DIVERSE MATERIALS OR FLOWS {10}
297  DF  .~ Funnel type {3}
299.~.~ Concentric external vent

DEFINITION

Classification: 141/299

(under subclass 297) Filling devices having a flow conduit which encircles the contents material outlet conduit of the funnel and which is open to the ambient atmosphere at least while the material outlet is open.

(1) Note. Both vent and supply passages may be uncontrolled, or either or both may be valved.