(under subclass 348) Apparatus in which there is means to apply a vacuum to a closed filtrate receiver with no liquid being removed to the vacuum source.
SEE OR SEARCH THIS CLASS, SUBCLASS:
416, for liquid pump, gas pressure or liquid suction source combinations.
459+, for a pipe end attached filter which pipe may be a suction pipe.
481, for a filter element of the type often used with a reflux or vacuum coffee maker.
