(under the class definition) Subject matter which includes either a material or a sample designed to be placed next to or upon a material or sample to be examined on the basis of reflected light intensity; and which includes either light generating and optical means to direct the generated light, or optical means to direct natural light onto the material or sample to be examined, so that the light is reflected therefrom for examination by visual or photosensitive means to indicate or record, when so desired, the intensity or differences of intensity of the reflected light.
(1) Note. This subject matter is limited to surface reflection.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237.1+, for visual light inspection apparatus which check for local variations in the overall light intensity from articles or material as caused by imperfections or flaws.
300+, for dispersion type test apparatus which reflects light from standards or unknown substances at selected frequencies.
369, for measuring or testing surface reflection using polarized light.
372+, for mensuration devices with which measurement is based upon the intensity of light reflected from an article or material.
402+, for devices which measure the intensity of light reflected from materials or the comparison of colors by means of reflective standards. SEE OR SEARCH CLASS
73, Measuring and Testing,
29, for the determination of vapor content of a gas by light scattering of a light beam reflected from a test surface; subclasses 104+ for surface testing; and subclass 160 for measuring the light intensity of a reflected beam of light from a dyed thread sample which is indicative of the color of the sample.
209, Classifying, Separating, and Assorting Solids,
580+, and 587 for radiant energy devices which separate articles physically on the basis of the intensity of reflected radiation which is correlated to the surface or the color of the article.
250, Radiant Energy,
216+, wherein light reflected from articles, material, or animate beings controls a photosensitive detector.
340, Communications: Electrical,
227, 234, and 235 for electrical signalling apparatus which utilize the intensity of reflected light to note a change of condition including ice formation, moisture, or humidity conditions.
