US PATENT SUBCLASS 137 / 857
.~.~.~.~.~ With spring

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
843  DF  .~.~ Resilient material valve {4}
852  DF  .~.~.~ With valve member flexing about securement {4}
855  DF  .~.~.~.~ Flap or reed {3}
857.~.~.~.~.~ With spring

DEFINITION

Classification: 137/857

(under subclass 855) Valve wherein a resilient, energy storing, bias means is provided.