(under subclass 57) Processes in which the organic compound is heterocyclic.
(1) Note. The term heterocyclic denotes the presence of a ring whose members are composed of at least one carbon atom and one or more atoms of the elements taken from the group consisting of nitrogen, oxygen, sulfur, selenium and tellurium.
(2) Note. Carbohydrates and their derivatives unless shown to be acyclic are presumed to be heterocyclic compounds.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57, for a distillation process utilizing a ring oregano boron or oregano phosphorus compound.
SEE OR SEARCH CLASS
208, Mineral Oils: Processes and Products, 325+, for a process of fractionating mineral oil in which a heterocyclic organic compound is a selective solvent.
