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CPC Subgroup
H04L 1/18

Automatic repetition systems, e.g. Van Duuren systems

Full Title

Arrangements for detecting or preventing errors in the information received > by using return channel > in which the return channel carries supervisory signals, e.g. repetition request signals > Automatic repetition systems, e.g. Van Duuren systems

8 direct subcodes

Child Classifications

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  • H04L 1/1803 Stop-and-wait protocols
  • H04L 1/1806 Go-back-N protocols
  • H04L 1/1809 Selective-repeat protocols
  • H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
  • H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions

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