(under the class definition) Physical processes not more specifically provided for in other classes.
(1) Note. Patents containing both a claim to an inorganic compound or non-metallic element, and a claim to a physical process for this class, are classified in Class 423, Chemistry of Inorganic Compounds, and cross-referenced here.
(2) Note. The removal or addition of water of hydration or cystallization is considered a chemical reaction and not a physical process for this class. For such processes see the appropriate chemical class, e.g., 423, Chemistry of Inorganic Compounds, 260, Chemistry of Carbon Compounds, 585, Chemistry of Hydrocarbon Compounds, etc.
(3) Note. Processes for preserving chemicals and compositions are classified with the chemical or composition preserved and processes of packaging chemicals are classified in Class 53, Package Making, except when chemicals classifiable in Classes 260, Chemistry of Carbon Compounds, and 423, Chemistry of Inorganic Compounds, 585, Chemistry of Hydrocarbon Compounds, are stored by means of a chemical combination from which the chemicals may be subsequently released, when they are classified on the basis of the chemical combination so formed.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids, for drying
processes. 53, Package Making, appropriate subclasses for methods of and apparatus for encompassing or encasing goods or materials with a separate cover or band which serves as means for identifying, protecting or unit handling the goods or materials. See (3) Note.
62, Refrigeration,
600+, for processes and apparatus specialized to the manufacture of a solidified or liquefied product from a gas by physical treatment only.
75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures, for processes provided for in that class which may include a physical process.
95, Gas Separation: Processes, for physical processes of gas separation and purification.
100, Presses,
35+, for processes for compacting material, not elsewhere provided for.
127, Sugar, Starch, and Carbohydrates, for processes of extracting and crystallizing sugar.
159, Concentrating Evaporators, for processes of concentrating solutions or suspensions of solids in liquids.
201, Distillation: Processes, Thermolytic, appropriate subclasses for a destructive distillation process.
203, Distillation: Processes, Separatory, appropriate subclasses for a separatory distillation process.
209, Classifying, Separating, and Assorting Solids, for processes of separating solids from solids. 210, Liquid Purification or Separation,
634+, especially 643+ for processes of liquid purification including dialysis, and subclasses 800+ for processes for liquid separation by gravitational force.
241, Solid Material Comminution or Disintegration, appropriate subclass, for processes and apparatus involving comminution and see section 2 of the class definition of that class (241) for the line.
261, Gas and Liquid Contact Apparatus, for processes for contacting gases and liquids when for a purpose other than that of gas separation or purification.
264, Plastic and Nonmetallic Article Shaping or Treating: Processes, appropriate subclasses for processes involving shaping or molding of plastic materials, noting, for example,
4, pertaining to encapsulating of normally liquid material.
366, Agitating, for mixing or agitating processes.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
243+, for physical type apparatus including apparatus used in carrying out come processes of this class (23).
426, Food or Edible Material: Processes, Compositions, and Products, appropriate subclasses for physical processes involving foods.
432, Heating, 1+, for a material heating process of general utility.
494, Imperforate Bowl: Centrifugal Separators, appropriate subclasses for apparatus and process for breaking up a mixture of fluids or fluent substances into two or more components by centrifuging within a generally solid-walled, receptacle-like member.
