US PATENT SUBCLASS 137 / 856
.~.~.~.~.~ With stop

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}
856.~.~.~.~.~ With stop

DEFINITION

Classification: 137/856

(under subclass 855) Valve wherein an abutment is located in close proximity to said resilient member to restrict the travel of said member as it moves from a closed to an open position.