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CPC Subgroup
H04N 9/44

Colour synchronisation

Full Title

Details of colour television systems > Colour synchronisation

5 direct subcodes

Child Classifications

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  • H04N 9/45 Generation or recovery of colour sub-carriers
  • H04N 9/455 Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals (H04N9/45 takes precedence)
  • H04N 9/465 Synchronisation of the PAL-switch
  • H04N 9/47 for sequential signals
  • H04N 9/475 for mutually locking different synchronisation sources

Top Applicants

Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. HUAWEI TECHNOLOGIES COMPANY CN 101,476
  2. QUALCOMM US 101,139
  3. SAMSUNG ELECTRONICS COMPANY KR 96,655
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
  5. LG ELECTRONICS KR 55,253
  6. HUAWEI TECHNOLOGIES COMPANY 54,181
  7. SONY CORPORATION JP 35,309
  8. ZTE CORPORATION CN 32,950
  9. INTEL CORPORATION US 27,533
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498