US PATENT SUBCLASS 73 / 861.25
.~.~ Reflection or scattering of acoustic waves

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}
861.25.~.~ Reflection or scattering of acoustic waves

DEFINITION

Classification: 73/861.25

Reflection or scattering of acoustic waves:

(under subclass 861.18) Subject matter wherein the rate of flow is determined by acoustic waves transmitted to and reflected or scattered by the fluid.