CPC Subgroup
H04N 3/22 Circuits for controlling dimensions, shape or centering of picture on screen
Full Title
Scanning details of television systems; Combination thereof with generation of supply voltages > by means not exclusively optical-mechanical (H04N3/36 takes precedence) > by deflecting electron beam in cathode-ray tube > Circuits for controlling dimensions, shape or centering of picture on screen
3 direct subcodes
Child Classifications
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- H04N 3/223 Controlling dimensions (by maintaining the cathode-ray tube high voltage constant H04N3/185)
- H04N 3/227 Centering
- H04N 3/23 Distortion correction, e.g. for pincushion distortion correction, S-correction
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- HUAWEI TECHNOLOGIES COMPANY CN 101,476
- QUALCOMM US 101,139
- SAMSUNG ELECTRONICS COMPANY KR 96,655
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
- LG ELECTRONICS KR 55,253
- HUAWEI TECHNOLOGIES COMPANY 54,181
- SONY CORPORATION JP 35,309
- ZTE CORPORATION CN 32,950
- INTEL CORPORATION US 27,533
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498