US PATENT SUBCLASS 73 / 514.27
.~.~.~.~ Frequency or phase shift

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
514.01  DF  .~ Acceleration determination utilizing inertial element {8}
514.16  DF  .~.~ Specific type of electric sensor or specific type of magnetic sensor {9}
514.26  DF  .~.~.~ Optical sensor {1}
514.27.~.~.~.~ Frequency or phase shift

DEFINITION

Classification: 73/514.27

Frequency or phase shift:

(under subclass 514.26) Subject matter wherein the modification of the light beam comprises a frequency or phase shift.

SEE OR SEARCH THIS CLASS, SUBCLASS:

657, for an inertial-type vibration sensing means modifying a light by a shift in frequency or phase to provide an indication or a measurement.