C09B 43/20 with monocarboxylic acids, carbamic acid esters or halides, mono- isocyanates or haloformic acid esters
Full Title
Preparation of azo dyes from other azo compounds > by acylation of hydroxyl group > with monocarboxylic acids, carbamic acid esters or halides, mono- isocyanates or haloformic acid esters
Filing statistics
CPC C09B 43/20 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
5 direct subcodes
Child Classifications
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- C09B 43/22 having the carboxylic group directly attached to an aromatic carbocyclic ring
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