US PATENT SUBCLASS 367 / 89
.~ Speed determination

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87  DF  ECHO SYSTEMS {6}
89.~ Speed determination {1}
90  DF  .~.~> By doppler effect {1}

DEFINITION

Classification: 367/89

Speed determination:

(under subclass 87) Subject matter for determining the rate of change of distance between a transmitting-receiving device and the acoustic wave reflector.

SEE OR SEARCH CLASS

606, Surgery,

2+, for ultrasonic determination of blood flow.