US PATENT SUBCLASS 239 / 158
.~.~.~.~ Gas pressure pump

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

146  DF  WITH MOBILE TANK-TYPE SUPPLY MEANS {9}
155  DF  .~ Operational means interconnected with ground traverse {1}
156  DF  .~.~ Ground wheel operated discharge means or controller {1}
157  DF  .~.~.~ Ground wheel operated pump {1}
158.~.~.~.~ Gas pressure pump

DEFINITION

Classification: 239/158

(under subclass 157) Apparatus in which the moving means acts upon gas in contradistinction to liquids.

(1) Note. The usual type of gas pump in this group is that in which air is compressed and transferred to the top of a liquid which is then ejected by the gas pressure.