US PATENT SUBCLASS 73 / 861.84
.~.~.~.~ Differentially responsive turbines

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

861  DF  VOLUME OR RATE OF FLOW {23}
861.79  DF  .~ Using turbine {5}
861.81  DF  .~.~ With response modification {2}
861.83  DF  .~.~.~ Axial supply and delivery {1}
861.84.~.~.~.~ Differentially responsive turbines

DEFINITION

Classification: 73/861.84

Differentially responsive turbines:

(under subclass 861.83) Subject matter wherein at least two freely rotatable turbines with differentially pitched vanes respond to the same flow to provide different or opposite rotation rates.