IPC Subgroup
H01J 17/22 Means for obtaining or maintaining the desired pressure within the tube
Introduced: September 1968
Last revised: January 2012
Full Title
Gas-filled discharge tubes with solid cathodes > Details > Means for obtaining or maintaining the desired pressure within the tube
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2 direct subcodes
Child Classifications
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- H01J 17/24 Means for absorbing or adsorbing gas, e.g. by gettering
- H01J 17/26 Means for producing, introducing, or replenishing gas or vapour during operation of the tube