(under the class definition) Subject matter wherein the bag comprises either (1) means for relieving positive or negative pressure inside the bag (or bag structure), or (2) means which allow circulation of fluid (e.g., air) into and out of the bag.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45, for a bag having a content responsive closure and a vent.
SEE OR SEARCH CLASS
55, Gas Separation,
429, and Digest 2 for vacuum cleaner bags.
220, Receptacles,
203.01+, for a receptacle closure comprising a pressure responsive vent or valve.
