(under subclass 426) Subject matter wherein the supported and rotated or agitated articles are containers holding fluids, and the inspection is directed to the fluid itself, the inspection of the container being incidental.
(1) Note. Subclasses 337+ deal with fluids which have uniformly entrained within them particles which cause scattering when tested by a directed beam of light transmitted through the fluid. Here the particles entrained do not create a uniform condition, but a localized undesired imperfection within the encapsulated or contained fluid.
SEE OR SEARCH CLASS
73, Measuring and Testing,
61.41+, for the testing of suspensions of solids in liquids for determining the ratio of solid and like foreign matters to the liquid.
250, Radiant Energy,
564+, for fluent material in the optical path and a photocell circuit; and subclasses 573+ for the detection of a fluent material in the optical path.
