CPC Subgroup
H04N 1/40 Picture signal circuits (H04N1/387 takes precedence)
Full Title
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits (H04N1/387 takes precedence)
15 direct subcodes
Child Classifications
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- H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head (H04N1/403 takes precedence)
- H04N 1/403 Discrimination between the two tones in the picture signal of a two-tone original
- H04N 1/405 Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N 1/409 Edge or detail enhancement; Noise or error suppression
Top Applicants
Top 10 applicants by patent filingsfor 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