US PATENT SUBCLASS 416 / 231 R
.~ Apertured or permeable

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

223 R  DF  SPECIFIC BLADE STRUCTURE (E.G., SHAPE, MATERIAL, ETC.) {18}
231 R.~ Apertured or permeable {2}
231 A  DF  .~.~> Mixers or agitators
231 B  DF  .~.~> Slotted blade

Unofficial Alpha Subclasses: R A B

DEFINITION

Classification: 416/231

(under subclass 223) Apparatus wherein the working member (1) has one or more openings extending therethrough or (2) is made up of material which is intended to permit the flow of fluid therethrough.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90+, for blades having fluid intake or discharge openings thereon and see (2) Note thereunder.

227, for blades of open work, or lattice or loop forms.