US PATENT SUBCLASS 250 / 559.41
.~.~.~ With foreign particle discrimination circuitry

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
559.01  DF  .~ With circuit for evaluating a web, strand, strip, or sheet {13}
559.4  DF  .~.~ With indication of presence of material or feature {5}
559.41.~.~.~ With foreign particle discrimination circuitry

DEFINITION

Classification: 250/559.41

With foreign particle discrimination circuitry:

(under subclass 559.4) Subject matter wherein the circuit provides the capability to identify the presence of a foreign substance on or embedded in the material from variations in a detected light signal.