Picture signal circuits (H04N1/387 takes precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Picture signal circuits

CPC: Picture signal circuits (H04N1/387 takes precedence)

Full Title

Full titles differ between systems:

IPC:

Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits

CPC:

Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits (H04N1/387 takes precedence)

CPC subdivides this area 3x more granularly than IPC with 10 additional codes.

10 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1995.

Child Classifications

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H04N 1/40006 CPC only CPC only
H04N 1/40012 CPC only CPC only
H04N 1/40025 +4 CPC CPC only CPC only
H04N 1/40056 CPC only CPC only
H04N 1/40062 CPC only CPC only
H04N 1/40068 CPC only CPC only
H04N 1/40075 CPC only CPC only
H04N 1/40081 CPC only CPC only
H04N 1/40087 CPC only CPC only
H04N 1/40093 CPC only CPC only
H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head (H04N1/403 takes precedence) since 1995 +1 CPC IPC+CPC Available in IPC and CPC
H04N 1/403 Discrimination between the two tones in the picture signal of a two-tone original since 1995 IPC+CPC Available in IPC and CPC
H04N 1/405 Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels since 1995 +2 CPC IPC+CPC Available in IPC and CPC
H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level since 1995 +2 CPC IPC+CPC Available in IPC and CPC
H04N 1/409 Edge or detail enhancement; Noise or error suppression since 1995 +3 CPC IPC+CPC Available in IPC and CPC

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