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IPC Subgroup
H01J 21/02

Tubes with a single discharge path

Introduced: September 1968

Last revised: January 2006

Full Title

Vacuum tubes > Tubes with a single discharge path

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC ELEMENTS
Subclass:
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS

Filing statistics

IPC H01J 21/02 belongs to the parent subclass H01J, which recorded 110,789 patent applications worldwide between 2013 and 2023. Annual filings grew from 9,068 in 2013 to 10,705 in 2023 (+18%), peaking at 11,872 applications in 2021. The most active applicants in class H01 are TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY (43,574 applications), SAMSUNG ELECTRONICS COMPANY (42,206 applications) and LG CHEM (21,383 applications).

Source: EPO PATSTAT, worldwide filings

3 direct subcodes

Child Classifications

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  • H01J 21/04 without control means, i.e. diodes
  • H01J 21/18 having magnetic control means; having both magnetic and electrostatic control means

Top Applicants

Top 10 applicants by patent filingsfor class H01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 43,574
  2. SAMSUNG ELECTRONICS COMPANY KR 42,206
  3. LG CHEM KR 21,383
  4. APPLIED MATERIALS US 20,441
  5. LG ENERGY SOLUTION KR 20,279
  6. SAMSUNG DISPLAY KR 19,725
  7. CHINESE ACADEMY OF SCIENCES 19,400
  8. TOYOTA MOTOR CORPORATION 18,819
  9. SGCC(STATE GRID CORPORATION OF CHINA) 18,082
  10. TOKYO ELECTRON JP 17,634