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PCE
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CPC Subgroup
C09B 35/021

characterised by 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 two coupling components of the same type

6 direct subcodes

Child Classifications

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  • C09B 35/023 in which the coupling component is a hydroxy or polyhydroxy compound
  • C09B 35/025 in which the coupling component is an amine or polyamine
  • C09B 35/033 in which the coupling component is an arylamide of an o-hydroxy-carboxylic acid or of a beta-keto-carboxylic acid
  • C09B 35/035 in which the coupling component containing an activated methylene group

Top Applicants

Top 10 applicants by patent filingsfor class C09, 2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 7,954
  2. HALLIBURTON ENERGY SERVICES GROUP US 6,584
  3. NITTO DENKO CORPORATION JP 6,500
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
  5. DOW GLOBAL TECHNOLOGIES US 6,324
  6. FUJIFILM JP 5,832
  7. MERCK PATENT DE 5,481
  8. BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
  9. SAMSUNG DISPLAY KR 5,105
  10. NITTO DENKO CORPORATION 3,584