IPC Subgroup
H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
Introduced: January 1985
Last revised: January 2023
Full Title
Details of colour television systems > Circuits for processing colour signals > for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- PICTORIAL COMMUNICATION, e.g. TELEVISION
Additional Content
Circuits for processing colour signals for colour killing combined with colour gain control Colour balance circuits Camera processing pipelines for controlling the colour saturation of colour signals
1 direct subcode
Child Classifications
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- H04N 9/69 for modifying the colour signals by gamma correction
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327