(under subclass 23.2) Subject matter wherein the nature or amount of particulate matter in gas is determined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31.01, for measuring other impurities in the air.
170.25, for measuring solid particles originating in the outer space surrounding the Earth.
863.21+, for sampling involving separation of constituents where no testing device is claimed.
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, aersol, cloud, mist) or agents for such systems or making or stabilizing such systems or agents subclass 114 for processes of or compositions for or subcombination compositions for the breaking of or inhibiting of colloid systems of conitinuous gas or vapor phase (e.g., fog dispelling, dust suppressing, contrail suppressing); in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.
