(under subclass 422) Apparatus including endless rotating belts, either permeable, or impermeable which support material and means for so treating the material by gaseous current that the heaviest constituents settle as a stratum on the support, while the lighter constituents either form relatively displaced strata or are carried away by the gaseous currents.
SEE OR SEARCH CLASS
428, Stock Material or Miscellaneous Articles, appropriate subclasses for a stock material product in the form of a single or plural layer web or sheet which is not specifically provided for in any other class.
474, Endless Belt Power Transmission Systems or Components, particularly
202+, for a positive drive belt; and subclasses 237+ for a friction drive belt.
