(under subclass 2.1) Methods for causing a particulate type of solidification of a liquid or gaseous material by spraying that material into an atmosphere in which the ambient temperature is below the materials freezing point.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.2, for snowmaking apparatus.
SEE OR SEARCH CLASS
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,
1+, for continuous gas or vapor phase colloid system (e.g., smoke, fog, aerosol, cloud, mist) or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art; and when not disclosed as adapted to (1) wet a surface or (2) to precipitate atmospheric moisture, for which see Class 239, the appropriate subclass for compositions for or
methods of breaking or inhibiting continuous gas or vapor phase colloid systems.
