DIFF Subgroup
H01J 29/48 Electron guns
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details of cathode-ray tubes or of electron-beam tubes of the types covered by group > Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement > Electron guns
CPC:
Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00 > Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement > Electron guns
CPC subdivides this area 4x more granularly than IPC with 6 additional codes.
6 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H01J 29/50 two or more guns in a single vacuum space, e.g. for plural-ray tube (H01J29/51 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
- H01J 29/51 Arrangements for controlling convergence of a plurality of beams since 1974 IPC+CPC Available in IPC and CPC