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CPC Subgroup
C09B 43/32

by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines

Full Title

Preparation of azo dyes from other azo compounds > by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines

4 direct subcodes

Child Classifications

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  • C09B 43/34 by reacting ortho- or peri-dicarboxylic dyes
  • C09B 43/36 with amino-anthracene or amino-anthraquinone dyes
  • C09B 43/38 by reacting two or more ortho-hydroxy naphthoic acid dyes with polyamines

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