CPC Subgroup Additional Only
H01J 2201/30 Cold cathodes
Full Title
Electrodes common to discharge tubes > Cold cathodes
7 direct subcodes
Child Classifications
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- H01J 2201/304 Field emission cathodes
- H01J 2201/306 Ferroelectric cathodes
- H01J 2201/308 Semiconductor cathodes, e.g. having PN junction layers
- H01J 2201/312 having an electric field perpendicular to the surface thereof
- H01J 2201/316 having an electric field parallel to the surface thereof, e.g. thin film cathodes
- H01J 2201/317 combined with other synergetic effects, e.g. secondary, photo- or thermal emission
- H01J 2201/319 Circuit elements associated with the emitters by direct integration
Top Applicants
Top 10 applicants by patent filingsfor 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