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Class Information
Number: 356/424
Name: Optics: measuring and testing > By shade or color > With reflective multicolor chart or standard > Drum or endless tape
Description: Subject matter wherein the surfaces are in the form of a endless member such as a tape or a drum.

Patents under this class:

Patent Number Title Of Patent Date Issued
8603772 Particle sensor with wide linear range Dec. 10, 2013
6244863 Dental color comparator scope Jun. 12, 2001
4904605 Method and apparatus for residential water test kit Feb. 27, 1990
4797256 Registration device for blood test strips Jan. 10, 1989

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