US PATENT SUBCLASS 340 / 619
.~.~.~.~.~ Optical sensor

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
603  DF  .~.~ Fluent material {7}
612  DF  .~.~.~ Material level {6}
618  DF  .~.~.~.~ Liquid {5}
619.~.~.~.~.~ Optical sensor

DEFINITION

Classification: 340/619

Optical sensor:

(under subclass 618) Subject matter wherein the liquid level is detected by a device responsive to or conducting light rays.

SEE OR SEARCH CLASS

250, Radiant Energy,

564+, and 577 for a prephotocell or optical system responsive to liquid level, but not including a claimed indicating means.