US PATENT SUBCLASS 239 / 487
.~.~ Axially extending spiral-type flow passage or diverter

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}
463  DF  .~ Fluid rotation inducing means upstream of outlet {12}
487.~.~ Axially extending spiral-type flow passage or diverter {2}
488  DF  .~.~.~> Having a solid core
489  DF  .~.~.~> In or on flow-passage walls

DEFINITION

Classification: 239/487

(under subclass 463) Apparatus having flow passages of helical form which cause the fluid to spin or rotate and which extend a substantial length in the general direction of flow.

(1) Note. The arrangement of the devices in this and the indented subclasses is such that the spiral passages also form axially extending channels; that is, the fluid enters at an upstream zone and is carried through the spiral passages to a downstream egress opening.