(under subclass 445) Subject matter including visual or photoelectric apparatus which compares the reflected light in intensity from the sample or material with the light from a standard material or article.
(1) Note. The usual comparator type includes regular and stereomicroscopes wherein a comparison of the reflected light intensity is made with a standard, which may be a photograph, where no dimensional length, profile, color plus light intensity, or flaw check is involved.
SEE OR SEARCH THIS CLASS, SUBCLASS:
402+, for comparison systems of the visual and photoelectric type which are based upon the frequency and the intensity of light reflected from at least the unknown material or sample.
SEE OR SEARCH CLASS
250, Radiant Energy,
208, and 578 for plural light sources and photocells which may be used in a comparator of light intensity as reflected from a sample or material with a standard light intensity where no indicator or test material support is claimed.
340, Communication: Electrical, 146.3, and 825.30+ which may utilize the intensity of light
as reflected from documents to note the position of identifying marks or items on the documents.
359, Optics: Systems (Including Communication) and Elements,
373, for compound lens systems of the object comparator type.
382, Image Analysis,
112, which may utilize the intensity of light as reflected from the document to denote the information content.
