(under subclass 403) Methods limited to exhausting or removing gas or vapor from a receptacle and completing the enclosure.
(1) Note. The exhausting or removing requires a positive pumping or suction. Mere valving or venting so as to allow a flow of gas is not here considered to be evacuating.
(2) Note. This subclass is restricted to gas or vapor handling in combination with closing. Any additional treatment of contents or filling with articles or fluent material requires that the combination be classified in the appropriate subclasses below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for apparatus including gas charging and/or evacuating combined with closing.
408, for methods of gas charging a receptacle and completing the enclosure including evacuating.
432+, for methods which subject the contents of a package to a vacuum. 440+, for apparatus including gas charging and/or evacuating combined with closing.
SEE OR SEARCH CLASS
141, Fluent Material Handling, With Receiver or Receiver Coacting Means,
4+, for processes of modification of the gaseous content of a receiver, per se.