US PATENT SUBCLASS 73 / 861.29
.~.~.~.~ In both directions simultaneously

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

861  DF  VOLUME OR RATE OF FLOW {23}
861.18  DF  .~ By measuring vibrations or acoustic energy {5}
861.27  DF  .~.~ Transit time of acoustic waves {2}
861.28  DF  .~.~.~ Transmitted along single path {1}
861.29.~.~.~.~ In both directions simultaneously

DEFINITION

Classification: 73/861.29

In both directions simultaneously:

(under subclass 861.28) Subject matter wherein the acoustic waves are simultaneously transmitted upstream and downstream along the same path.