(under subclass 38) Apparatus including means to close or open a vent opening on a container when the position of the container is varied, e.g., when the container is tipped.
SEE OR SEARCH THIS CLASS, SUBCLASS:
583+, for distribution systems having plural flow passages, one of which is a gas vent, and see the search notes to subclass 583.
SEE OR SEARCH CLASS
222, Dispensing,
500, for gravity or inertia actuated outlet elements for dispensers. 429, Chemistry: Electrical Current Producing Apparatus, Product, and Process,
84+, for vents combined with battery structure and battery vents, per se, of the nonspill type.
