IPC Subgroup
H01K 1/52 Means for obtaining or maintaining the desired pressure within the vessel
Introduced: September 1968
Last revised: January 2006
Full Title
Details > Means for obtaining or maintaining the desired pressure within the vessel
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC INCANDESCENT LAMPS
1 direct subcode
Child Classifications
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- H01K 1/54 Means for adsorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering