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PCE
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CPC Subgroup
C09B 33/04

in which the coupling component is a dihydroxy or polyhydroxy compound

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 > in which the coupling component is a dihydroxy or polyhydroxy compound

4 direct subcodes

Child Classifications

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  • C09B 33/044 the coupling component being a bis-phenol
  • C09B 33/048 the coupling component being a bis-naphthol
  • C09B 33/052 the coupling component being a bis-(naphthol-amine)
  • C09B 33/056 the coupling component being a bis-(naphthol-urea)

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