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CPC Subgroup
C09B 33/02

Disazo dyes

Full Title

Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling > Disazo dyes

7 direct subcodes

Child Classifications

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  • C09B 33/06 in which the coupling component is a diamine or polyamine
  • C09B 33/12 in which the coupling component is a heterocyclic compound
  • C09B 33/147 in which the coupling component is a bis -(-o-hydroxy-carboxylic- acid amide)
  • C09B 33/153 in which the coupling component is a bis-(aceto-acetyl amide) or a bis-(benzoyl-acetylamide)
  • C09B 33/16 from other coupling components

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