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Class Information
Number: 250/559.2
Name: Radiant energy > Photocells; circuits and apparatus > With circuit for evaluating a web, strand, strip, or sheet > Measuring dimensions > With comparison to reference or standard
Description: Subject matter wherein evaluation of the material includes comparing the circuit output to a reference or stored value.

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4963731 Optical level measurement system Oct. 16, 1990
4929844 Apparatus for detecting the presence and size of a document May. 29, 1990
4803371 Optical scanning method and apparatus useful for determining the configuration of an object Feb. 7, 1989
4764680 Method of and arrangement for testing cylindrical objects for shape deviations Aug. 16, 1988
4752695 Planarity detection method for a moving rolled strip employing side edge detection with respect to a reference surface Jun. 21, 1988
4745291 Apparatus for measuring thickness of layer on substance May. 17, 1988
4730116 Sheet thickness measuring apparatus by optical scanning Mar. 8, 1988
4713550 Document size detection apparatus Dec. 15, 1987
4703187 Method and apparatus for the determination of the thickness of transparent layers of lacquer Oct. 27, 1987
4578770 Method of discriminating sheet Mar. 25, 1986
4467215 Tape surface discriminating system Aug. 21, 1984
4459487 Method and apparatus for identifying objects such as bottles by shape Jul. 10, 1984
4415811 Optical scanning apparatus Nov. 15, 1983
4393313 Width detector system Jul. 12, 1983
4347441 Dual probe interferometer for object profile measuring Aug. 31, 1982
4294545 Device for continuously measuring a transverse dimension of a thread-like structure Oct. 13, 1981
4264825 Film splice detector system Apr. 28, 1981
4168437 Optoelectric multi-sensor measuring apparatus and a method for measuring surface flatness therewith Sep. 18, 1979
4132314 Electronic size and color sorter Jan. 2, 1979
4115702 Device for measuring at least one dimension of an object and a method of operating said device Sep. 19, 1978
4043673 Reticle calibrated diameter gauge Aug. 23, 1977
3992107 Automatic flat width control Nov. 16, 1976
3986037 Yarn detector with a self-calibrating circuit Oct. 12, 1976
3947130 Metrological TV microscope Mar. 30, 1976
3941484 Non-contact dimensional measurement technique Mar. 2, 1976
3932755 Device for detecting double sheet feeding Jan. 13, 1976

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