US PATENT SUBCLASS 416 / 177
.~ Flow confining casing, shroud or passage

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

176  DF  SPIRAL BLADE OR FLOW PASSAGE (360 DEGREE) {1}
177.~ Flow confining casing, shroud or passage

DEFINITION

Classification: 416/177

(under subclass 176) Apparatus wherein the impeller comprises (1) a circumferentially continuous working fluid directing surface integral with the working members thereof or (2) a flow passage which wholly confines the working fluid while in working engagement therewith.