.~.~ Hollow lead surrounding another lead (e.g., concentric type)
DEFINITION
Classification: 174/50.55
(under subclass 50.5) Subject matter having a hollow tubular lead-in conductor passing through the wall of the envelope and having another lead-in conductor arranged within the hollow lead-in conductor.
(1) Note. The lead-in conductors are ordinarily concentrically arranged. This subclass includes therefor envelopes with co-axial lead-ins where no electrical
characteristics of the lead-ins such as the inductance, capacity, or resonant features are involved and also includes envelopes where the portion of the lead-ins which passes through the wall are stepped or displaced along the length of each other as in some types of "light house" tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50.53, for this subject matter where the hollow tubular lead-in is a part of the envelope wall and is designed also for use as an electrical connector and the other lead is arranged within the hollow lead-in (as in some types of "light house" tubes).
151+, for devices (e.g., bushings) for insulating a plurality of concentric arranged conductors from a wall or plate through which the conductors extend (the bushing may be fluid tight).
SEE OR SEARCH CLASS 178, Telegraphy,
44, for concentrically arranged transmission lines including those with hermetically sealed joints between the conductors and those designed to pass through a wall or plate where electrical characteristics of the conductors, such as the inductance, capacity or resonant features are involved.
315, Electric Lamp and Discharge Devices: Systems,
39, for electric lamps and electric space discharge devices which have structurally combined therewith a wave guide or co-axial high frequency transmission line (the wave guide or coaxial line may extend through the walls of the envelope of the device).
