CPC Main Group
C09B 56/00 Azo dyes containing other chromophoric systems
10 direct subcodes
Child Classifications
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- C09B 56/02 Azomethine-azo dyes
- C09B 56/04 Stilbene-azo dyes
- C09B 56/08 Styryl-azo dyes
- C09B 56/10 Formazane-azo dyes
- C09B 56/12 Anthraquinone-azo dyes
- C09B 56/14 Phthalocyanine-azo dyes
- C09B 56/16 Methine- or polymethine-azo dyes
- C09B 56/18 Hydrazone-azo dyes
- C09B 56/20 Triazene-azo dyes
Top Applicants
Top 10 applicants by patent filingsfor class C09, 2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 7,954
- HALLIBURTON ENERGY SERVICES GROUP US 6,584
- NITTO DENKO CORPORATION JP 6,500
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
- DOW GLOBAL TECHNOLOGIES US 6,324
- FUJIFILM JP 5,832
- MERCK PATENT DE 5,481
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
- SAMSUNG DISPLAY KR 5,105
- NITTO DENKO CORPORATION 3,584