(under subclass 4) Processes wherein the material subjected to the oxidizing treatment is itself an asphalt, tar or pitch.
(1) Note. The processes classified herein involve the modification of the general properties of the asphalt, pitch or tar, e.g., raise the melting point thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128, and 130, for processes of converting mineral oils in the presence of air or steam respectively involving no oxidation of the oil.
SEE OR SEARCH CLASS
106, Compositions: Coating or Plastic, appropriate subclasses, and particularly
273.1+, for coating or plastic compositions containing oxidized asphalts, tars or pitches and a nonmineral oil additive.
