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DIFF Subgroup
H04L 25/20

Repeater circuits; Relay circuits

Introduced: September 1968

Full Title

Baseband systems > Details > Repeater circuits; Relay circuits

Of 7 combined children, 3 exist in both systems.

3 codes are CPC-only extensions, 1 exist only in IPC.

Child Classifications

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  • H04L 25/202 CPC only CPC only
  • H04L 25/205 CPC only CPC only
  • H04L 25/207 CPC only CPC only
  • H04L 25/22 Repeaters for converting two wires to four wires; Repeaters for converting single current to double current IPC+CPC Available in IPC and CPC
  • H04L 25/26 Circuits with optical sensing means IPC+CPC Available in IPC and CPC
  • H04L 25/28 Repeaters using modulation and subsequent demodulation IPC only IPC only

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

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