US PATENT SUBCLASS 261 / 122.2
.~.~.~.~ With closable apertures

Current as of: June, 1999
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261 /   HD   GAS AND LIQUID CONTACT APPARATUS

75  DF  CONTACT DEVICES {11}
119.1  DF  .~ Liquid tank {5}
121.1  DF  .~.~ Submerged blast {5}
122.1  DF  .~.~.~ Submerged screen {1}
122.2.~.~.~.~ With closable apertures

DEFINITION

Classification: 261/122.2

With closable apertures:

(under subclass 121.1) Apparatus wherein the screen has an aperture which closes when gas flow stops, so that liquid flow through the aperture is prevented or retarded.