US PATENT SUBCLASS 239 / 501
.~.~ Surfaces of spiral or helical form

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

461  DF  FLOW DEFLECTING OR ROTATION CONTROLLING MEANS {9}
500  DF  .~ Serially arranged deflecting surfaces {1}
501.~.~ Surfaces of spiral or helical form

DEFINITION

Classification: 239/501

(under subclass 500) Apparatus in which the dispersing or redirecting surfaces are arranged in the form of convolutions coiled or wound around an axis, the fluid passing between the convolutions.