CPC Subgroup
C09B 31/16 Trisazo dyes
Full Title
Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling > Trisazo dyes
5 direct subcodes
Child Classifications
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- C09B 31/18 from a coupling component "D" containing a directive amine group
- C09B 31/20 from a coupling component"D" containing a directive hydroxyl group
- C09B 31/22 from a coupling component "D" containing directive hydroxyl and amino groups
- C09B 31/24 from a coupling component "D" containing reactive methylene groups
- C09B 31/26 from other coupling components "D"
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