US PATENT SUBCLASS 137 / 843
.~.~ Resilient material valve

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.~.~ Resilient material valve {4}
844  DF  .~.~.~> Having expansible port {2}
851  DF  .~.~.~> Center flexing strip
852  DF  .~.~.~> With valve member flexing about securement {4}
860  DF  .~.~.~> Annulus

DEFINITION

Classification: 137/843

(under subclass 511) Valve in which the valve member or the valve seat is made of resilient easily deformable material which yields in response to pressure to open the valve. The restoring force of the resilient material constitutes a major component of the biasing means.

(1) Note. The use of resilient sealing means (e.g., rubber washer) at the valve seat does not make the arrangement classifiable herein. The use of such sealing means is conventional throughout the class.