US PATENT SUBCLASS 250 / 559.01
.~ With circuit for evaluating a web, strand, strip, or sheet

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
559.01.~ With circuit for evaluating a web, strand, strip, or sheet {13}
559.02  DF  .~.~> Evaluation of photographic film
559.03  DF  .~.~> Sequential detector arrangement
559.04  DF  .~.~> Evaluation by regions, zones, or pixels {2}
559.07  DF  .~.~> With imaging {1}
559.09  DF  .~.~> With polarization
559.1  DF  .~.~> With calibration
559.11  DF  .~.~> Detection of both reflected and transmitted light
559.12  DF  .~.~> Beam interruption or shadow {3}
559.16  DF  .~.~> Detection of diffuse light {2}
559.19  DF  .~.~> Measuring dimensions {6}
559.29  DF  .~.~> Measuring position {9}
559.39  DF  .~.~> With comparison to reference or standard
559.4  DF  .~.~> With indication of presence of material or feature {5}

DEFINITION

Classification: 250/559.01

With circuit for evaluating a web, strand, strip, or sheet:

(under subclass 200) Subject matter wherein a photocell is responsive to light from a material having a cross-sectional dimension which is small compared to length, and through additional structure (i.e., a circuit) produces an electrical or mechanical output indicative of some characteristic of the material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

548, for similar subject matter wherein the output is employed to control the material.

SEE OR SEARCH CLASS

356, Optics: Measuring and Testing,

237.1+, for the inspection for flaws or imperfections, subclasses 364+ for the examination of materials using polarized light, subclasses 371+ for flatness tests, subclasses 372+ for measurement of dimensions, subclasses 399+ for determining lateral alignment, subclasses 402+ for shade or color tests, subclasses 429+ for monitoring of moving webs or thread, subclasses 432+ for determining light transmission or absorption of materials, and subclasses 445+ for measuring the reflectivity of materials.