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CPC Subgroup
H01J 21/20

Tubes with more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode

Full Title

Vacuum tubes (H01J25/00, H01J31/00 - H01J40/00, H01J43/00, H01J47/00, H01J49/00 take precedence; details of vacuum tubes H01J19/00) > Tubes with more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode

3 direct subcodes

Child Classifications

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  • H01J 21/22 with movable electrode or electrodes
  • H01J 21/24 with variable amplification factor
  • H01J 21/26 with means for concentrating the electron stream

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