US PATENT SUBCLASS 210 / 500.1
.~ Material

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

348  DF  FILTER {25}
500.1.~ Material {6}
500.21  DF  .~.~> Semipermeable membrane {6}
501  DF  .~.~> Sterilizing or neutralizing agent containing
502.1  DF  .~.~> Sorptive component containing
503  DF  .~.~> Diverse granular or fibrous {2}
506  DF  .~.~> Coated or impregnated, e.g., adhesively bound {2}
510.1  DF  .~.~> Porous unitary mass

DEFINITION

Classification: 210/500.1

Material:

(under subclass 348) Compositions comprising materials to be used in filter apparatus.

(1) Note. Materials consisting of fibers (e.g., paper) comprising a homogeneous mass of fibers, with or without binders or randomly dispersed fillers made by a Class 162 method are in Class 162 even though defined as a filter material. Such material having additional features peculiar to filtration are in Class 210, subclasses, 500.1+ e.g., perforations, fibers on a perforated backing, strata of fibers of different kinds, etc.

(2) Note. A patent for stock material which may have filtering properties but in which there is no claimed internal or external structure particularly adapting the material for use as a filter will be placed in the appropriate stock material class. See, especially, Class 428, Stock Material or Miscellaneous Articles, and the search notes thereunder.

(3) Note. A composition claimed or disclosed solely as a sorbent or claimed as a filter aid and disclosed to aid filtering solely as a sorbent is classifiable in Class 502. A composition claimed as filtering material i.e., by presenting apertures or interstices of a size functioning to retain solid matter by a screening or sieving action with or without a sorbing action is classifiable in Class 210, subclasses 500.1+. Class 210, subclass 500.1 filter material is superior to Class 502. A copy of a patent properly classified in 210, subclasses 500.1+ will be crossed to Class 502 only on the basis of a novel sorbent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

483+, for supported, shaped, or superimposed filter mediums.

SEE OR SEARCH CLASS 106, Compositions: Coating or Plastic, appropriate subclasses for plastic compositions in general, and see (2) Note of that class definition.

139, Textiles: Weaving,

383+, for fabrics having no particular shape or specific structure peculiar to filtering.

162, Paper Making and Fiber Liberation, (see (1) Note).

204, Chemistry: Electrical and Wave Energy,

295+, for diaphragms or membranes to be used in electrolytic apparatus.

252, Compositions,

175+, for water softening or purifying compositions; subclasses 182.11+ for filter materials which exert a chemical action.

428, Stock Material or Miscellaneous Articles,

304.4+, for a product of composite form in which one component is either porous or cellular and subclasses 357+ for a mass or layer of structurally defined or coated elements (e.g., fibers, filaments, particles).

429, Chemistry: Electrical Current Producing Apparatus, Product and Process, 129+, and 247+ for separators (diaphram) specialized for that class.

442, Fabric (Woven, Knitted, or Nonwoven Textile or Cloth, etc.),

409+, for an autogenously bonded nonwoven fabric.

502, Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making, for a composition comprising a catalyst or sorbent, per se.