US PATENT SUBCLASS 250 / 905
.~.~ With longitudinal irregularity

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.~.~ With longitudinal irregularity {3}
906  DF  .~.~.~> With large scale longitudinal bend
907  DF  .~.~.~> With portions of light guide coating or cladding removed
908  DF  .~.~.~> With waveguide twisted about its longitudinal axis

DEFINITION

Classification: 250/905

With longitudinal irregularity:

(under subclass 904) Art collection of liquid level sensors related to those in ... in which the light conducting guide has some nonregular aspect along its longitudinal axis. For example, the surface of the light conducting guide is not parallel to the longitudinal axis thereof, or has a variation in its optical parameters along its longitudinal axis, e.g., a graded refractive index.

(1) Note. Illustration of longitudinal irregularities appear below: [figure]