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IPC Subgroup
H04M 3/51

Centralised call answering arrangements requiring operator intervention

Introduced: January 2000

Last revised: January 2006

Full Title

Automatic or semi-automatic exchanges > Systems providing special services or facilities to subscribers > Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers > Centralised call answering arrangements requiring operator intervention

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
TELEPHONIC COMMUNICATION

2 direct subcodes

Child Classifications

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  • H04M 3/52 Arrangements for routing dead number calls to operators
  • H04M 3/523 with call distribution or queuing

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