(under subclass 436) Subject matter including in the light path, liquid particle suspensions, such as turbid or coloidal suspensions, paint, or milk; and including a detector and indicator of the transmitted radiation through the liquid which is correlated to the turbidity of the solution or the number of the particles causing the turbidity.
(1) Note. Both static and through-flow type test devices are included.
(2) Note. In visual turbidity devices of the static and extinction type, scales are associated with the devices to note the depth at which the extinction of light occurs.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39, for determining characteristics of blood particles present in a sample.
246, for fluid containers, per se, peculiar to testing.
335+, for determining the size of the particles or the size and the number of the particles present in a turbid solution. 337+, for particle light scattering wherein the light detected is that reflected from the particles in the turbid suspension.
SEE OR SEARCH CLASS
73, Measuring and Testing,
64.66, for the testing of the settling rate of a liquid suspension of solids.
250, Radiant Energy,
564+, for circuits for evaluating a fluent material; and subclasses 573+ for photocell detection of fluent material in an optical path.
