IPC Subgroup
H01J 1/52 Screens for shielding; Guides for influencing the discharge; Masks interposed in the electron stream
Introduced: September 1968
Last revised: January 2006
Full Title
Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps > Screens for shielding; Guides for influencing the discharge; Masks interposed in the electron stream
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS