US PATENT SUBCLASS 111 / 185
.~.~.~.~.~ Air pressure differential

Current as of: June, 1999
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111 /   HD   PLANTING

14  DF  DRILLING {12}
170  DF  .~ Having depositor feature {5}
177  DF  .~.~ Rotating dispensing element {2}
183  DF  .~.~.~ Plate type trap {1}
184  DF  .~.~.~.~ Vertical {1}
185.~.~.~.~.~ Air pressure differential

DEFINITION

Classification: 111/185

Air pressure differential:

(under subclass 184) Apparatus wherein the charge of material is held on the surface of the disk by an air pressure differential caused by (1) the creation of a subatmospheric pressure on one side of the disk which is expressed through holes in the disk surface or (2) by a superatmospheric pressure which traps material against the surface.

SEE OR SEARCH CLASS

221, Article Dispensing,

211, for suction type discharge assistants, per se.