US PATENT SUBCLASS 196 / 138
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MINERAL OILS: APPARATUS
> Dephlegmators or fractionating columns
> Contact with cooling fluid
> Automatically controlled temperature
(under the class definition) Apparatus for condensing mineral-oil vapors which by construction and operation is peculiar to this art.
SEE OR SEARCH CLASS
165, Heat Exchange, appropriate subclasses, for a heat exchanger not specialized to condesing mineral-oil vapor.
202, Distillation: Apparatus, appropriate subclasses, for distillation apparatus particularly
208, Mineral Oils: Processes and Products
347, for distillation of mineral oils.