US PATENT SUBCLASS 250 / 902
.~.~ With closed light path preset

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

900  DF  OPTICAL LIQUID LEVEL SENSORS {2}
901  DF  .~ With gap between light guide elements (includes open light path preset) {1}
902.~.~ With closed light path preset {1}
903  DF  .~.~.~> With prism contacting liquid

DEFINITION

Classification: 250/902

With closed light path preset:

(under subclass 901) Art collection of liquid level sensors related to those in ... in which light from the light source is normally transmitted across the gap formed by light conductor end faces to the photodetector in the absence of liquid in the gap.

(1) Note. An illustration of this situation is found above, in the definition of subclass 901.