US PATENT SUBCLASS 73 / 861.59
.~.~.~ Including recirculation pump

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

861  DF  VOLUME OR RATE OF FLOW {23}
861.42  DF  .~ Using differential pressure {6}
861.52  DF  .~.~ With restriction {4}
861.59.~.~.~ Including recirculation pump

DEFINITION

Classification: 73/861.59

Including recirculation pump:

(under subclass 861.52) Subject matter wherein a constant volumetric recirculating pump is used to add or subtract a given volumetric flow of fluid to the flow being measured.