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IPC Subgroup
H04L 25/2

Repeater circuits; Relay circuits

Introduced: September 1968

Last revised: January 2006

Full Title

Baseband systems > Details > Repeater circuits; Relay circuits

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

4 direct subcodes

Child Classifications

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  • H04L 25/22 Repeaters for converting two wires to four wires; Repeaters for converting single current to double current
  • H04L 25/24 Relay circuits using discharge tubes or semiconductor devices
  • H04L 25/26 Circuits with optical sensing means
  • H04L 25/28 Repeaters using modulation and subsequent demodulation

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