Main electrodes

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps > Main electrodes

CPC:

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps (details of electron-optical or ion-optical arrangements H01J3/00) > Main electrodes

Of 9 combined children, 8 exist in both systems.

1 codes are CPC-only extensions.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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H01J 1/025 CPC only CPC only
H01J 1/04 Liquid electrodes, e.g. liquid cathode IPC+CPC Available in IPC and CPC
H01J 1/12 Cathodes having mercury or liquid alkali metal deposited on the cathode surface during operation of the tube IPC+CPC Available in IPC and CPC
H01J 1/13 Solid thermionic cathodes +1 CPC IPC+CPC Available in IPC and CPC
H01J 1/30 Cold cathodes, e.g. field-emissive cathode IPC+CPC Available in IPC and CPC
H01J 1/32 Secondary-electron-emitting electrodes (H01J1/35 takes precedence) IPC+CPC Available in IPC and CPC
H01J 1/34 Photo-emissive cathodes (H01J1/35 takes precedence) IPC+CPC Available in IPC and CPC
H01J 1/35 Electrodes exhibiting both secondary emission and photo-emission IPC+CPC Available in IPC and CPC
H01J 1/36 Solid anodes; Solid auxiliary anodes for maintaining a discharge IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

Class H01,2013–2023, worldwide · Source: EPO PATSTAT

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