US PATENT SUBCLASS 210 / 164
.~.~ Flat grating at surface level

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

153  DF  STRUCTURAL INSTALLATION {6}
163  DF  .~ Grated inlet surface drain {2}
164.~.~ Flat grating at surface level {1}
165  DF  .~.~.~> With subsurface weep means

DEFINITION

Classification: 210/164

(under subclass 163) Structures where the upper face of the strainer is flat and is level with its associated surface.