US PATENT SUBCLASS 73 / 861.27
.~.~ Transit time 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}
861.27.~.~ Transit time of acoustic waves {2}
861.28  DF  .~.~.~> Transmitted along single path {1}
861.31  DF  .~.~.~> Transmitted along parallel paths

DEFINITION

Classification: 73/861.27

Transit time of acoustic waves:

(under subclass 861.18) Subject matter responsive to the transit time of acoustic waves transmitted through the fluid along a path extending between upstream and downstream locations.

(1) Note. Usually, a comparison of upstream and downstream transit times is effected.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339, and 597, for measuring transit time of acoustic waves to determine other properties of a fluid (e.g., density, temperature, etc.).