US PATENT SUBCLASS 137 / 247.41
.~.~ U-seals

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.41.~.~ U-seals {3}
247.43  DF  .~.~.~> Topside access beneath cover plate closed floor opening
247.45  DF  .~.~.~> Enlarged upflow leg {1}
247.49  DF  .~.~.~> Even diameter legs {1}

DEFINITION

Classification: 137/247.41

(under subclass 247.11) Seals wherein theU-shaped passage comprises a U-bend of which one leg thereof is an inlet pipe and constitutes the downflow column and the other leg is distinct and externally spaced from the first leg and constitutes the upflow column.