US PATENT SUBCLASS 367 / 90
.~.~ By doppler effect

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

87  DF  ECHO SYSTEMS {6}
89  DF  .~ Speed determination {1}
90.~.~ By doppler effect {1}
91  DF  .~.~.~> Vehicle mounted system for determining vehicle speed

DEFINITION

Classification: 367/90

By doppler effect:

(under subclass 89) Subject matter which utilizes the frequency shift of the reflected signal to determine the relative speed of the reflector.

SEE OR SEARCH CLASS

73, Measuring and Testing,

861.18+, for determining the rate of flow of a fluid by measuring the doppler shift of an acoustic wave emitted into the fluid.