DIFF Subgroup
C09B 29/36 from heterocyclic compounds
Introduced: September 1968
Full Title
Monoazo dyes prepared by diazotising and coupling > from other coupling components > from heterocyclic compounds
Of 10 combined children, 0 exist in both systems.
6 codes are CPC-only extensions, 4 exist only in IPC.
IPC defines codes here since 1980.
Child Classifications
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- C09B 29/4 containing a five-membered ring with one nitrogen atom as the only ring hetero atom since 1980 IPC only IPC only
- C09B 29/42 containing a six-membered ring with one nitrogen atom as the only ring hetero atom since 1980 −1 IPC IPC only IPC only
Top Applicants
Top Applicants (IPC)
Class C09,2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 6,420
- NITTO DENKO CORPORATION JP 5,752
- HALLIBURTON ENERGY SERVICES GROUP US 5,650
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 5,635
- DOW GLOBAL TECHNOLOGIES US 4,844
- MERCK PATENT DE 4,779
- CHINESE ACADEMY OF SCIENCES 4,311
- FUJIFILM JP 4,205
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 4,039
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,931
Top Applicants (CPC)
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