US PATENT SUBCLASS 600 / 453
.~.~.~ Doppler effect (e.g., fetal HR monitoring)

Current as of: June, 1999
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600 /   HD   SURGERY

300  DF  DIAGNOSTIC TESTING {38}
407  DF  .~ Detecting nuclear, electromagnetic, or ultrasonic radiation {11}
437  DF  .~.~ Ultrasonic {10}
453.~.~.~ Doppler effect (e.g., fetal HR monitoring) {1}
454  DF  .~.~.~.~> Blood flow studies {2}

DEFINITION

Classification: 600/453

Doppler effect (e.g., fetal HR monitoring):

(under subclass 437) Subject matter wherein the ultrasonic wave is varied in frequency or shifted as a result of relative motion between the wave source and moving internal organs or structures in the body to which the wave is applied.