US PATENT SUBCLASS 137 / 247.13
.~.~ Valves

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}
247.13.~.~ Valves {1}
247.15  DF  .~.~.~> Line condition change responsive {3}

DEFINITION

Classification: 137/247.13

(under subclass 247.11) Apparatus having a valve in the liquid flow line in or adjacent to the seal.