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DIFF Main Group
H04L 7/00

Arrangements for synchronising receiver with transmitter

Introduced: September 1968

Additional Content IPC

Synchronising in computer bus systems Synchronisation arrangements specially adapted for spread spectrum techniques , , Synchronising in radio transmission systems Synchronising in radio relay systems, e.g. satellite networks Synchronising in radio transmission between mobile posts Arrangements for synchronising broadcast or distribution via plural distribution systems Synchronisation arrangements in time-division multiplex systems Synchronising in television systems for transmission of a pulse code modulated with a pulse code modulated synchronising signal Synchronisation processes in servers specifically adapted for selective pictorial content distribution, e.g. interactive television Content authoring involving timestamps for synchronising content, e.g. for the generation of multimedia applications Synchronising a decoder's clock in selective pictorial content distribution Synchronisation arrangements in wireless communication networks

CPC subdivides this area 5x more granularly than IPC with 8 additional codes.

8 codes are CPC-only extensions.

Child Classifications

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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