US PATENT SUBCLASS 73 / 589
.~.~ Acoustical impedance

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

570  DF  VIBRATION {10}
584  DF  .~ By mechanical waves {13}
589.~.~ Acoustical impedance

DEFINITION

Classification: 73/589

Acoustical impedance:

(under subclass 584) Subject matter for determining the acoustical impedance of the body to vibration, as by the ratio of sound pressure to the volume velocity, the ratio of sound pressure to particle velocity, etc.