US PATENT SUBCLASS 166 / 328
.~.~.~.~ Loose ball closure

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  DF  .~.~ One way, e.g., check valve type {2}
327  DF  .~.~.~ Shoes with check valve {1}
328.~.~.~.~ Loose ball closure

DEFINITION

Classification: 166/328

(under subclass 327) Devices wherein the valve comprises a loose ball that closes the valve opening to prevent reverse flow.