US PATENT SUBCLASS 250 / 908
.~.~.~ With waveguide twisted about its longitudinal axis

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

900  DF  OPTICAL LIQUID LEVEL SENSORS {2}
904  DF  .~ With single light guide element to guide light in a continuous path {1}
905  DF  .~.~ With longitudinal irregularity {3}
908.~.~.~ With waveguide twisted about its longitudinal axis

DEFINITION

Classification: 250/908

With waveguide twisted about its longitudinal axis:

(under subclass 905) Art collection of liquid level sensors relating to those in ... in which a light conducting waveguide is twisted about its longitudinal axis, which results in a conversion of the lowest order light beam transverse electromagnetic (TEM) modes input into the light conducting waveguide into an output of higher order modes because of the continually rotating cross-section of the waveguide. An illustration of this type of waveguide appears below: [figure]