US PATENT SUBCLASS 210 / 166
.~.~ Concentric guard ring or rib

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}
166.~.~ Concentric guard ring or rib

DEFINITION

Classification: 210/166

(under subclass 163) Apparatus comprising a concentric ring or rib between the strainer and its associated surface wherein the ring or rib projects above the plane of the surface.