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IPC Main Group
H04S 3/00

Systems employing more than two channels, e.g. quadraphonic

Introduced: January 1980

Last revised: January 2006

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
STEREOPHONIC SYSTEMS

Filing statistics

IPC H04S 3/00 belongs to the parent subclass H04S, which recorded 22,505 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,395 in 2013 to 1,920 in 2023 (+38%), peaking at 2,472 applications in 2019. The most active applicants in class H04 are QUALCOMM (97,396 applications), HUAWEI TECHNOLOGIES COMPANY (96,502 applications) and SAMSUNG ELECTRONICS COMPANY (86,981 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Pseudo-stereophonic systems Indicating arrangements of stereophonic systems; Control arrangements, e.g. balance control of stereophonic systems

1 direct subcode

Child Classifications

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  • H04S 3/02 of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other

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