US PATENT SUBCLASS 239 / 489
.~.~.~ In or on flow-passage walls

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  DF  .~.~ Axially extending spiral-type flow passage or diverter {2}
489.~.~.~ In or on flow-passage walls

DEFINITION

Classification: 239/489

(under subclass 487) Apparatus in which the inner surface of the flow conduit has integral vanes or ribs thereon thereby forming the helical flow passages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

481, for other devices in which the whirling is accomplished by spirals or threads on the flow passage walls, with additional means to select either the whirling flow path thus provided or another non-whirling path.