US PATENT SUBCLASS 416 / 91
.~ Both inlet and outlet to working fluid

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

90 R  DF  WITH FLUID PASSAGE IN WORKING MEMBER COMMUNICATING WITH WORKING FLUID {3}
91.~ Both inlet and outlet to working fluid

DEFINITION

Classification: 416/91

(under subclass 90) Apparatus wherein both the inlet and outlet to the passage are open to the working fluid, the flow within the passage comprised, at least in part, of working fluid.