(under subclass 8) Structures having means for preserving or maintaining the character of the fluid. For example, this includes means for drying gases, dehydrating liquids, and all forms of chemical or physical treatment of the fluid other than mere cooling, fluid feeding, circulating or distributing which is in this class, subclasses 15.1 and 16.
(1) Note. Electrical equipment containing fluid dielectrics having a preservative ingredient as the sole preserving means are not in this subclass but in subclass 8 or other appropriate indented subclass.
(2) Note. For processes, compositions and apparatus for purifying materials, not limited to combination with subject matter for this class, see the appropriate class.
SEE OR SEARCH CLASS
95, Gas Separation: Processes, for processes, compositions and apparatus for purifying materials, not limited to combination with subject matter for this class (174).
96, Gas Separation: Apparatus, for processes, compositions and apparatus for purifying materials, not limited to combination with subject matter for this class (174).
137, Fluid Handling, 455+, pipes and other fluid handling devices combined with
means responsive to a change in the conditions in the line for maintaining or correcting the condition.
191, Electricity: Transmission to Vehicles,
27, for heated conduits restricted to the purpose of that class.
210, Liquid Purification or Separation, especially
243, for electrical insulating or electricity discharging means which is ancillary to a separator and subclasses 167+ for separators in a closed circulating system for an art device not provided for elsewhere; and
252, Compositions, has fluid dielectric compositions containing preservative ingredients.
261, Gas and Liquid Contact Apparatus, for processes, compositions and apparatus for purifying materials, not limited to combination with subject matter for this class (174).
313, Electric Lamp and Discharge Devices,
545, 566 for electric lamps and electronic tubes which are provided with a getter or gas or vapor generating material to preserve, maintain, or used to secure a desired vacuum or gas or vapor atmosphere within the envelope of the device.
