US PATENT SUBCLASS 250 / 577
.~.~.~ Volume or level

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
573  DF  .~.~ Fluent material in optical path {4}
577.~.~.~ Volume or level

DEFINITION

Classification: 250/577

(under subclass 573) Subject matter including structure associated with the photocell or the placement of the photocell to specifically detect the volume or elevation of a contained fluent material.