(under subclass 500) Subject matter comprising (1) granules differing in shape or composition, (2) fibers differing in shape or composition, or (3) combined granules and fibers.
(1) Note. The materials may be laminated, imbedded in each other or be of one layer having differing sections, e.g., precoated elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
488+, for formed laminated members forming a unitary filter element.
510, for fused or sintered porous material.
SEE OR SEARCH CLASS
428, Stock Material or miscellaneous Articles, 292.1+, for a stock material product in the form of a composite sheet or web embodying a component having structurally defined fibers, subclasses 323+ for such a product embodying a component having structurally defined particles, and subclasses 357+ for a mass or layer of structurally defined or coated element (e.g., fibers, filaments, particles).
