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IPC Subgroup
H01J 29/39

Charge-storage screens

Introduced: September 1968

Last revised: January 2006

Full Title

Details of cathode-ray tubes or of electron-beam tubes of the types covered by group > Electrodes; Screens; Mounting, supporting, spacing, or insulating thereof > Screens on, or from, which an image or pattern is formed, picked-up, converted, or stored > Photoelectric screens; Charge-storage screens > Charge-storage screens

Classification Context

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

4 direct subcodes

Child Classifications

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  • H01J 29/41 using secondary emission, e.g. for supericonoscope
  • H01J 29/43 using photo-emissive mosaic, e.g. for orthicon, for iconoscope
  • H01J 29/44 exhibiting internal electric effects caused by particle radiation, e.g. bombardment-induced conductivity
  • H01J 29/45 exhibiting internal electric effects caused by electromagnetic radiation, e.g. photoconductive screen, photodielectric screen, photovoltaic screen

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