(under subclass 308) Processes wherein an asphaltic fraction is separated from the remaining portion of the mineral oil.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39+, for processes of recovering, making or treating an asphalt as a product. Note particularly subclass 45 for the recovery of asphalt by extraction. Processes classified in this subclass (309) are those in which the object is to obtain a refined mineral oil of reduced asphalt content and there is no recovery of asphalt as a product.
86, for processes of deasphalting combined with a chemical conversion of the deasphalted mineral oil.
