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IPC Subgroup
H04N 5/16

Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level

Introduced: September 1968

Last revised: January 2006

Full Title

Details of television systems > Picture signal circuitry for video frequency region > Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
PICTORIAL COMMUNICATION, e.g. TELEVISION

Additional Content

Circuits for reinsertion of DC and slowly varying components of colour signals

1 direct subcode

Child Classifications

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  • H04N 5/18 by means of "clamp" circuit operated by switching circuit

Top Applicants

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

  1. QUALCOMM US 97,396
  2. HUAWEI TECHNOLOGIES COMPANY CN 96,502
  3. SAMSUNG ELECTRONICS COMPANY KR 86,981
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
  5. HUAWEI TECHNOLOGIES COMPANY 55,349
  6. LG ELECTRONICS KR 53,649
  7. CANON 33,341
  8. SONY CORPORATION JP 32,761
  9. ZTE CORPORATION CN 32,274
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327