(under subclass 50.5) Subject matter wherein the envelope has at least a portion of its wall formed of metal or other conductive material with a lead-in conductor which passes through the metal or conductive wall position and is insulated therefrom.
(1) Note. This subclass includes patents where the envelope is formed substantially entirely of metal and has lead-in conductors passing through the wall.
(2) Note. Where only the structure of the lead-in conductors, the wall of the envelope, and the means for insulating it from the wall is claimed, the device is classified in subclasses 151+ of this class as a bushing.
Such structure is classified in subclasses 151+ even if the envelope is claimed where no characteristics of the envelope are claimed in addition to the bushing structure. Envelopes having a plurality of separate lead-in conductors passing through the metal wall are classified in this subclass (50.56).
SEE OR SEARCH THIS CLASS, SUBCLASS:
50.55, where the envelope has two concentrically arranged conductors passing through the wall of the envelope, one of which may form a part of the envelope wall.
