(under subclass 344) Dispensers in which the flow from the main receptacle to the movable trapping chamber is (1) of the barometric control type, or (2) is of the type where solid material in the trapping chamber builds up to its angle of repose and stops flow from the main chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
437, for nonmovable barometric or angle of repose trap chambers with means to adjust the cut-off point to vary the volume trapped.
457, for miscellaneous combinations between a supply and a barometric or angle of repose trap chamber, and see the notes for related art.
479, for containers having plural, coterminous openings (usually tubular spouts), many of which are disclosed as operating on a barometric principle when used to deliver to an unclaimed receptacle.
