US PATENT SUBCLASS 416 / 41
.~.~ Natural fluid current

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}
40  DF  .~ Responsive to relative working fluid velocity {1}
41.~.~ Natural fluid current

DEFINITION

Classification: 416/41

(under subclass 40) Apparatus wherein the working fluid comprises natural fluid current.

(1) Note. By "natural fluid current" is meant the flow of fluid due to atmospheric conditions or to normal water currents. The flow of generated fluid (e.g., fan or blower forced), or of fluid past a moving body is not considered to be "natural fluid current" under this definition and devices having control means responsive to such flow will be found in the preceding subclass.