US PATENT SUBCLASS 250 / 559.4
.~.~ With indication of presence of material or feature

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.~.~ With indication of presence of material or feature {5}
559.41  DF  .~.~.~> With foreign particle discrimination circuitry
559.42  DF  .~.~.~> Discontinuity detection (e.g., hole, crack)
559.43  DF  .~.~.~> Break detection
559.44  DF  .~.~.~> Identifying marking, pattern, or indicia
559.45  DF  .~.~.~> With defect discrimination circuitry {3}

DEFINITION

Classification: 250/559.4

With indication of presence of material or feature:

(under subclass 559.01) Subject matter including a circuit responsive to a photocell, and wherein the photocell is arranged relative to the material so that the circuit provides an output indicating the presence or absence of the material or some indicia on the material in some predefined location.