US PATENT SUBCLASS 356 / 408
.~ With sequential comparison of sample and standard


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



356 /   HD   OPTICS: MEASURING AND TESTING

402  DF  BY SHADE OR COLOR {10}
408.~ With sequential comparison of sample and standard


DEFINITION

Classification: 356/408

With sequential comparison of sample and standard:

(under subclass 402) Subject matter wherein there is a light source and optical means to produce a beam or beams of visible light which may be monochromatic; (a) means to hold, move, and position sequentially either at least two samples or a sample and a standard into the path of the beam, or (b) means to cause the beam or beams to sweep or switch between fixed samples and standards; and electrical detecting and indicating means to note the light transmitted through or reflected from the samples and standards.