(under subclass 302) Process wherein a substance is mixed with the material treated which does not result in a chemical reaction with the treated material but the result of the interaction is a congealing or thickening of the material treated.
(1) Note. This subclass differs from subclasses 329+ in that the processes in this subclass involve treating a flowable material to increase its viscosity, while subclasses 329+, which also provide for the addition of a treating agent, involve treating both flowable and nonflowable material to produce a solid or particulate mass.
