(under subclass 338) Subject matter wherein the scattered light is compared with (a) a standard light, (b) a standard scattered light, (c) the directly transmitted light, or (d)
with the light prior to its scattering or transmission through the medium.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51, for testing by means of infrared or ultraviolet energy when the subject matter is of an optical nature and is used alone or in combination with visible light.
433+, for scattered light tests which measure the directed light through the fluid rather than the scattered light.
446, for devices which compare the light scattering from a surface rather than the reflection of light from particles suspended in a fluid, or colloids, or the molecules of a gas or liquid.
