Lines with other classes and within this class
(A) DISTILLATION PROCESSES
Patents claiming a distillation process and claiming distillation apparatus of general utility within the purview of Class 202 are classified in the appropriate distillation process class and cross-referenced to this Class (202). See References to Other Classes, below, for processes including a distillation operation.
(B) DISTILLATION APPARATUS
Patents claiming distillation apparatus of general utility are classified here unless otherwise provided for.
(1) Class 34, Drying and Gas Vapor Contact With Solids, is distinguished from Class 202 in that in Class 34 the combination of means for removing an extraneous liquid from a solid and means for condensing vapor produced must leave the solid chemically unchanged. In Class 202 apparatus is utilized to chemically alter the solid being treated.
(2) Class 48, Gas: Heating and Illuminating, takes apparatus for making heating and illuminating gases. The line between the apparatus in this class (202) for thermolytic distillation and the apparatus in Class 48 is that the apparatus in Class 48 has no solid carbonaceous material left in the material acted upon.
(3) Class 62, Refrigeration, takes apparatus for vaporizing a liquid mixture having a boiling point at atmospheric pressure below 0°C. (32°F.) and condensing the vapor except as otherwise provided in the Class Definition of Class 62. When a patent contains claims to Class 62 apparatus and Class 202 apparatus, the patent is classified in Class 62 and cross-referenced to Class 202.
(4) Class 134, Cleaning and Liquid Contact With Solids, takes processes and apparatus for contacting solids with liquids for cleaning or any purpose not provided for in other classes. The combination of means for contacting a solid with a liquid and means for distilling the liquid is in Class 134. The subcombination of distilling apparatus of general utility is classified here (202).
(5) Class 435, Chemistry: Molecular Biology and Microbiology, takes processes for fermentation including a distillation operation and apparatus that is peculiar to, or specialized and designed for use in, processes classified in Class 435.
(6) Class 196, Mineral Oils: Apparatus, takes all patents drawn to apparatus for distilling mineral oil. When a patent contains claims to apparatus for distilling mineral oil and claims to apparatus for distilling within the purview of Class 202, the patent is classified in Class 202 and cross-referenced to Class 196.
(7) Class 266, Metallurgical Apparatus, takes apparatus for heating metalliferous material combined with means for condensing the vapor. The line between Class 202 and Class 266 is that Class 266 takes apparatus for distilling metals, such as mercury and zinc, from their ores.
(8) Class 588, Hazardous or Toxic Waste Destruction or Containment, a process class, subclass 900 for a cross-reference art collection of apparatus used in the destruction of hazardous or toxic waste.
C. EVAPORATING APPARATUS
Apparatus designed to heat material to remove vapor therefrom without condensing at least a portion of the vapor is excluded from Class 202. Some classes which provide for apparatus including means for concentrating or evaporating without necessarily including condensing means are listed in References to Other Classes, below.