US PATENT SUBCLASS 118 / 691
.~.~.~ Photoelectric sensor

Current as of: June, 1999
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118 /   HD   COATING APPARATUS

663  DF  CONTROL MEANS RESPONSIVE TO A RANDOMLY OCCURRING SENSED CONDITION {5}
688  DF  .~ Responsive to condition of coating material {4}
689  DF  .~.~ Concentration of coating material in carrier medium {2}
691.~.~.~ Photoelectric sensor

DEFINITION

Classification: 118/691

Photoelectric sensor:

(under subclass 689) Apparatus wherein the means for measuring the quantity of one of the components of the coating material is composed of a light transmitting device and a light responsive device between which the coating material passes.