US PATENT SUBCLASS 137 / 516.27
.~.~.~ Sequential

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}
516.25  DF  .~.~ Plural seating {1}
516.27.~.~.~ Sequential {1}
516.29  DF  .~.~.~.~> Resilient gasket

DEFINITION

Classification: 137/516.27

(under subclass 516.25) Valves wherein the seating is sequential.