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Class Information
Number: 250/559.03
Name: Radiant energy > Photocells; circuits and apparatus > With circuit for evaluating a web, strand, strip, or sheet > Sequential detector arrangement
Description: Subject matter wherein photocells are arranged to perform plural independent successive detections of the same portion of the material and wherein the detections are subsequently jointly evaluated to determine some characteristic of the material.

Patents under this class:

Patent Number Title Of Patent Date Issued
8575581 Image reading apparatus Nov. 5, 2013
7920751 Adaptive gradient weighting technique for detector bad cell correction Apr. 5, 2011
7645979 Optical detection for low optical density web Jan. 12, 2010
7635830 Optical system for forming an illuminated pattern on a material in motion and which illuminated pattern is synchronized with a detection device Dec. 22, 2009
6201559 Method for measuring the quantity of light emergent from an optical tip array and image forming apparatus provided with an optical tip array Mar. 13, 2001
6163331 Method of correcting light quantity in an optical writing apparatus Dec. 19, 2000
6064058 Printed paper identification system May. 16, 2000
6033503 Adhesive sensing assembly for end jointed beam Mar. 7, 2000
5798531 System for detecting small holes in moving articles Aug. 25, 1998
5774227 Anomally detection machine for fabricated parts formed on a carrier strip and method of use Jun. 30, 1998
5696591 Apparatus and method for detecting longitudinally oriented flaws in a moving web Dec. 9, 1997
5641971 Method and device for counting and characterizing defects on a photographic support Jun. 24, 1997
5627363 System and method for three-dimensional imaging of opaque objects using frequency diversity and an opacity constraint May. 6, 1997
5245199 Mark detecting apparatus using active threshold comparison Sep. 14, 1993
5220178 Apparatus and process for detecting the presence of defects on a moving sheet of material Jun. 15, 1993
5182457 Device for photo-electrically monitoring a moving yarn using two sensor heads Jan. 26, 1993
5170060 Measuring the flow rate of a thin stream of molten material Dec. 8, 1992
5095214 Optical hole seeking apparatus having dual spaced laser scanners Mar. 10, 1992
4766324 Particle detection method including comparison between sequential scans Aug. 23, 1988
4705957 Wire surface monitor Nov. 10, 1987
4591726 Optical fault seeking apparatus for webs May. 27, 1986
4264825 Film splice detector system Apr. 28, 1981
4103177 Surface quality analysis Jul. 25, 1978
4079250 Programmable voltage sensing circuit Mar. 14, 1978

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