US PATENT SUBCLASS 416 / 172
.~ Alternating rotation

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

170 R  DF  SPECIFIC DRIVE OR TRANSMISSION MEANS {4}
172.~ Alternating rotation

DEFINITION

Classification: 416/172

(under subclass 170) Apparatus wherein an impeller rotates in a reverse angular at regular intervals, the rotation in each direction extending through at least one complete revolution.

SEE OR SEARCH THIS CLASS, SUBCLASS:

69, for operator supported manually actuated impellers having a similar operative motion.