US PATENT SUBCLASS 222 / 340
.~.~ For reciprocating piston on follower-type impeller


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.~.~ For reciprocating piston on follower-type impeller {1}
341  DF  .~.~.~> Biasing means within material chamber or passage


DEFINITION

Classification: 222/340

(under subclass 336) Dispensers in which the device is either a piston or a follower type impeller having a reciprocating motion and operating in either the supply receptacle or in a casing which receives material from the supply container, so that motion of the piston or follower applies pressure to the material to cause discharge.

SEE OR SEARCH THIS CLASS, SUBCLASS:

336, for reciprocating piston form conveyors or movable trap chambers, including movable trap chambers in the form of a stem having plural concentric enlargements thereon.

372+, for supply receptacles delivering to casings having pistons or followers therein, no biasing means for causing piston or follower motion being claimed.

386+, for receptacles having followers therein, there being no biasing means for causing follower motion being claimed.

449, for trap chamber cutoffs with biasing means. 518, for biased, reciprocable outlet elements such as valves, nozzles, closures, etc.

582, for a dispensing inkwell including a discharge assistant which is biased toward a resetting position following an actuating stroke, usually in the direction of the supply.

SEE OR SEARCH CLASS

221, Article Dispensing,

276, for article dispensers having spring biased reciprocating discharge assisting means, and subclass 271 for similar devices in which the reciprocating discharge assistant is spring biased to a discharging position.