US PATENT SUBCLASS 416 / 35
.~ With electrical means comparing and reducing error related to preset datum

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}
35.~ With electrical means comparing and reducing error related to preset datum

DEFINITION

Classification: 416/35

(under subclass 31) Apparatus comprising means to manually select and fix a desired operating condition or characteristic or other state from which there should be no variation and an electrical system including (1) means to receive signals based on the desired and the actual condition, characteristic or state, respectively and to relate the signals to one another and (2) means to control the apparatus to reduce the variation between the actual and the desired state.

(1) Note. Included under this definition of "electrical" are the well known electron devices, such as vacuum tubes, transistors, semi-conductors, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

30, for an apparatus comprising a drive motor and an impeller driven, thereby, interrelated controls for adjusting impeller pitch and drive motor throttle and an electrical system for sensing a condition or for actuating the controls.