CPC Subgroup
C09B 35/10 from two coupling components of the same type
Full Title
Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling > Disazo dyes > characterised by the tetrazo component > the tetrazo component being a derivative of biphenyl > from two coupling components of the same type
5 direct subcodes
Child Classifications
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- C09B 35/12 from amines
- C09B 35/14 from hydroxy compounds
- C09B 35/16 from hydroxy-amines
- C09B 35/18 from heterocyclic compounds
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