IPC Subgroup
C09B 35/1 from two coupling components of the same type
Introduced: September 1968
Last revised: January 2006
Full Title
Disazo or polyazo dyes of the type A ← D → B prepared by diazotising and coupling > Disazo dyes > characterised by the tetrazo component > the tetrazo component being a derivative of biphenyl > from two coupling components of the same type
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- Subclass:
- ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; MORDANTS; LAKES
4 direct subcodes
Child Classifications
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- C09B 35/12 from amines
- C09B 35/14 from hydroxy compounds
- C09B 35/16 from hydroxy amines
- C09B 35/18 from heterocyclic compounds
Top Applicants
Top 10 applicants by patent filingsfor 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