(under subclass 490) Apparatus in which the supporting means comprises either a slatted framework or a solid member with very shallow vertical walls upon which the media rests, without any further support or retaining means being disclosed in contact with the media.
(1) Note. Most of the patents in this subclass relate to powered or pulverulent material, such as lime, supported on a grid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
515, for a filter in a foraminous container.
516+, for particulate separating media held between open work members.
SEE OR SEARCH CLASS 248, Supports,
346.01, for grids or supports, per se, which may be disclosed for maintaining a powered or pulverulent gas separating media.
