US PATENT SUBCLASS 405 / 45
.~.~ Porous

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

36  DF  DRAINAGE OR IRRIGATION {7}
43  DF  .~ Porous or apertured pipe, flume, or tileway {6}
45.~.~ Porous

DEFINITION

Classification: 405/45

Porous:

(under subclass 43) Method or apparatus wherein the sidewall, a portion of the sidewall, or an aperture formed therein includes a foraminous material.