US PATENT SUBCLASS 222 / 341
.~.~.~ Biasing means within material chamber or passage

Current as of: June, 1999
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222 /   HD   DISPENSING

251  DF  WITH DISCHARGE ASSISTANT (E.G., IMPELLER, PUMP, CONVEYER, MOVABLE TRAP CHAMBER, ETC.) {30}
336  DF  .~ With biasing means for discharge assistant and/or its casing {3}
340  DF  .~.~ For reciprocating piston on follower-type impeller {1}
341.~.~.~ Biasing means within material chamber or passage

DEFINITION

Classification: 222/341

(under subclass 340) Dispensers in which at least one biasing means is within a chamber or passage containing material to be dispensed.