H01J2201/2867 - CPC Classification Index

ClassID:

205773 ⎘

H01J2201/2867 - CPC Classification

Classification description:

Electrodes common to discharge tubes; Heaters for thermionic cathodes; Characterised by the shape or size Spiral or helix

Sub-classes:

H01J2201/2871 » being flattened 1
H01J2201/2875 » being double, reverse helix or interwoven 0

Recent Application in this class:

20100239828

RESISTIVELY HEATED SMALL PLANAR FILAMENT

20090129550

Filament assembly having reduced electron beam time constant

20070090744

Filament for X-ray tube and X-ray tube having the same