(under subclass 2.1) Subject matter which are provided with an evacuating stem or opening for evacuating the envelope.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24+, for receptacle structure of general application provided with ordinary removable closures.
44, for closures which provide venting means for receptacles including connectors for evacuating purposes.
SEE OR SEARCH CLASS
65, Glass Manufacturing,
34, for a process of sealing off an exhaust opening in a glass envelope by a glassworking operation, subclass 153 for apparatus to fusion bond an exhaust tube to an envelope by glassworking, subclass 155 for electronic device making apparatus including fusion bonding means, and subclass 270 for apparatus for "tipping-off" a glass envelope. 174, Electrically: Conductors and Insulators,
8+, for envelopes, casings, and housings which are restricted by claimed subject matter to electrical use and in which a vacuum or fluid (gas) is employed or which have means peculiarly adapted for use in connection with a vacuum or with a material in a fluid condition. See subclasses 17.05+ and the subclasses specified in the Notes thereto for hermetically sealed envelopes which include electrical features (e.g., lead-in wires, electrical connectors, etc.) and which are provided with an evacuating stem or opening.
