CPC Main Group
C09B 43/00 Preparation of azo dyes from other azo compounds
Filing statistics
CPC C09B 43/00 belongs to the parent subclass C09B, which recorded 29,807 patent applications worldwide between 2013 and 2023. Annual filings declined from 3,030 in 2013 to 1,785 in 2023 (-41%), peaking at 3,329 applications in 2017. The most active applicants in class C09 are LG CHEM (7,954 applications), HALLIBURTON ENERGY SERVICES GROUP (6,584 applications) and NITTO DENKO CORPORATION (6,500 applications).
Source: EPO PATSTAT, worldwide filings
14 direct subcodes
Child Classifications
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- C09B 43/02 by sulfonation
- C09B 43/04 by nitration
- C09B 43/06 by oxidation
- C09B 43/08 by reduction
- C09B 43/11 by introducing hydrocarbon radicals or substituted hydrocarbon radicals on primary or secondary amino groups (formation of an amino group by reduction, e.g. of a nitro groups, C09B43/08)
- C09B 43/12 by acylation of amino groups
- C09B 43/18 by acylation of hydroxyl group
- C09B 43/28 by etherification of hydroxyl groups
- C09B 43/30 by esterification of —COOH or —SO3H groups
- C09B 43/32 by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines
- C09B 43/40 by substituting hetero atoms by radicals containing other hetero atoms
- C09B 43/44 by substituting amine groups for hydroxyl groups or hydroxyl groups for amine groups; Desacylation of amino-acyl groups; Deaminating
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