US PATENT SUBCLASS 166 / 325
.~.~ One way, e.g., check valve type

Current as of: June, 1999
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166 /   HD   WELLS

316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
319  DF  .~ Fluid operated {4}
325.~.~ One way, e.g., check valve type {2}
326  DF  .~.~.~> Flexible valve element
327  DF  .~.~.~> Shoes with check valve {1}

DEFINITION

Classification: 166/325

(under subclass 319) Devices in which the valve allows flow of fluids in one direction, but closes upon the reversing of flow in the opposite direction (check valve type).