US PATENT SUBCLASS 416 / 128
.~.~ Oppositely rotating impellers

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

120  DF  PLURAL IMPELLERS HAVING RELATIVE MOVEMENT OR INDEPENDENT SUPPORTS {5}
124  DF  .~ Coaxial rotation {4}
128.~.~ Oppositely rotating impellers {1}
129  DF  .~.~.~> Engine driven

DEFINITION

Classification: 416/128

(under subclass 124) Apparatus in which the direction of rotation of one of the impellers is contrary to the direction of rotation of another impeller supported coaxially therewith.

(1) Note. In this subclass may be found two oppositely rotating coaxial impellers adjustable only by the dynamic blade forces thereon, e.g., "free blade" type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

76+, for oppositely rotating coaxial impellers which are operator supported and manually actuated.

127, for oppositely rotating impellers concurrently adjusted by positive means.