US PATENT SUBCLASS 137 / 484.8
.~.~.~ Through separate aperture

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
484.2  DF  .~ Line flow effect assisted {2}
484.6  DF  .~.~ Reactor surface separated from flow by apertured partition {1}
484.8.~.~.~ Through separate aperture

DEFINITION

Classification: 137/484.8

(under subclass 484.6) Devices having an additional aperture for the accommodation of the valve stem.