US PATENT SUBCLASS 416 / 33
.~ Plural distinct impellers having related control

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

31  DF  WITH CONTROL MEANS RESPONSIVE TO NON-CYCLIC CONDITION SENSING, CENTRIFUGAL ACTUATION, TORQUE OR THRUST {9}
33.~ Plural distinct impellers having related control {1}
34  DF  .~.~> Synchronizing

DEFINITION

Classification: 416/33

(under subclass 31) Apparatus comprising control means for

two or more impellers* wherein (1) the adjustment of one or more impellers is in response to a condition of another impeller or (2) two or more impellers are adjusted in response to a common condition sensing means.

(1) Note. An impeller which is provided merely as an element is the control system for another is not considered to be a "distinct" impeller under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, for a device comprising automatic control in response to plural condition sensing and in which one of the conditions is atmospheric pressure (density or altitude).