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CPC Subgroup
H01J 19/06

characterised by the material

Full Title

Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the material

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

  1. SAMSUNG ELECTRONICS COMPANY KR 37,897
  2. TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 36,116
  3. APPLIED MATERIALS US 21,640
  4. LG ENERGY SOLUTION KR 20,770
  5. LG CHEM KR 19,835
  6. TOKYO ELECTRON JP 18,519
  7. ROBERT BOSCH DE 14,595
  8. INTEL CORPORATION US 13,580
  9. MURATA MANUFACTURING COMPANY JP 12,151
  10. SAMSUNG SDI COMPANY KR 12,080