US PATENT SUBCLASS 261 / 94
.~ Porous mass

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

75  DF  CONTACT DEVICES {11}
94.~ Porous mass {3}
95  DF  .~.~> Surface contact
96  DF  .~.~> Gas-flow control
97  DF  .~.~> Liquid-flow control {2}

DEFINITION

Classification: 261/94

Including a stationary porous mass of material (not a sheet) in contact with liquids and gases.

SEE OR SEARCH CLASS

239, Fluid Sprinkling, Spraying, and Diffusing,

34+, for slow diffusers, per se.

312, Supports: Cabinet Structure,

31+, particularly subclass 31.04.