IPC Subgroup
H01J 19/06 characterised by the material
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the material
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
4 direct subcodes
Child Classifications
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- H01J 19/062 with alkaline-earth metal oxides, or such oxides used in conjunction with reducing agents, as an emissive material
- H01J 19/064 with other metal oxides as an emissive material
- H01J 19/066 with metals or alloys as an emissive material
- H01J 19/068 with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material
Top Applicants
Top 10 applicants by patent filingsfor class H01, 2013–2023, worldwide · Source: EPO PATSTAT
- TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 43,574
- SAMSUNG ELECTRONICS COMPANY KR 42,206
- LG CHEM KR 21,383
- APPLIED MATERIALS US 20,441
- LG ENERGY SOLUTION KR 20,279
- SAMSUNG DISPLAY KR 19,725
- CHINESE ACADEMY OF SCIENCES 19,400
- TOYOTA MOTOR CORPORATION 18,819
- SGCC(STATE GRID CORPORATION OF CHINA) 18,082
- TOKYO ELECTRON JP 17,634