with two-way working, e.g. subscriber sending a programme selection signal

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Television systems > Analogue secrecy systems; Analogue subscription systems > with two-way working, e.g. subscriber sending a programme selection signal

CPC:

Television systems (details H04N3/00, H04N5/00; methods or arrangements, for coding, decoding, compressing or decompressing digital video signals H04N19/00; selective content distribution H04N21/00) > Analogue secrecy systems; Analogue subscription systems > with two-way working, e.g. subscriber sending a programme selection signal

Of 5 combined children, 0 exist in both systems.

5 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

Child Classifications

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H04N 2007/17372 2nd only CPC only CPC only
H04N 2007/17381 2nd only CPC only CPC only
H04N 2007/1739 2nd only CPC only CPC only
H04N 7/17309 +3 CPC CPC only CPC only
H04N 7/17345 +2 CPC CPC only CPC only

Top Applicants

Top Applicants (IPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

QUALCOMM US 97,396
HUAWEI TECHNOLOGIES COMPANY CN 96,502
SAMSUNG ELECTRONICS COMPANY KR 86,981
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
HUAWEI TECHNOLOGIES COMPANY 55,349
LG ELECTRONICS KR 53,649
CANON 33,341
SONY CORPORATION JP 32,761
ZTE CORPORATION CN 32,274
GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327

Top Applicants (CPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

HUAWEI TECHNOLOGIES COMPANY CN 101,476
QUALCOMM US 101,139
SAMSUNG ELECTRONICS COMPANY KR 96,655
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
LG ELECTRONICS KR 55,253
HUAWEI TECHNOLOGIES COMPANY 54,181
SONY CORPORATION JP 35,309
ZTE CORPORATION CN 32,950
INTEL CORPORATION US 27,533
GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498