US PATENT SUBCLASS 137 / 844
.~.~.~ Having expansible port

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}
844.~.~.~ Having expansible port {2}
845  DF  .~.~.~.~> Apertured plate
846  DF  .~.~.~.~> Having exit lip {4}

DEFINITION

Classification: 137/844

(under subclass 843) Valve wherein the valve member comprises a resilient body which has a passage therethrough which passage expands to an open position when fluid pressure is applied to the body and retracts upon itself into a closed position when pressure is removed to thus seal the passage against fluid flow.