(under subclass 262) Processes wherein the preexisting material is a gas or is initially a component of an emulsion or foam.
SEE OR SEARCH CLASS
95, Gas Separation: Processes, for physical processes involving steps resulting in separation of a gas from a fluid mixture comprising (a) a gas and solid or liquid particles entrained therein, (b) a liquid and gas entrained therein, or (c) a plurality of gases. The separation is not done by chemical reaction. See particularly
155, for processes of gas separation involving contacting with a liquid that contains a defoaming or antifoaming agent, subclass 157 for processes of gas separation involving liquid contacting and defoaming the liquid, and subclass 242 for defoaming a liquid.
137, Fluid Handling,
107+, for apparatus for controlling the degree of foaming in a gas charged liquid.
201, Distillation: Processes, Thermolytic,
9, for a process of surface treating the solid particles of the charge to inhibit, reduce, or prevent foaming during distillation. 202, Distillation: Apparatus,
264, for distillation apparatus intended to break foam or inhibit foaming.
203, Distillation: Processes, Separatory,
20, for processes of defoaming or inhibition of the formation of foam combined with distillation.
261, Gas and Liquid Contact Apparatus, appropriate subclasses for gas-liquid scrubbing devices.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,
113+, for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art. Nominal recitation of a Class 435 process (e.g., fermentation or fermentation step) combined with a process otherwise classifiable in Class 516 is proper for Class 516, while recitation of a significant Class 435 step combined with a step or composition otherwise classifiable in Class 516 is proper for Class 435 with a discretionary cross-reference to Class 516.
