(under subclass 46) Processes wherein the mineral oil to be converted is subjected to some separate and distinct nonconversion treatment combined with a subsequent chemical conversion of the treated oil.
(1) Note. Processes which include a single preliminary treatment defined by name only are not included in this or indented subclasses. Nor are processes included where the only "preliminary" treatment is heating the oil to conversion treatment (even though accompanied by vaporization of the oil) or the addition of the conversion catalyst or inerts, etc.
