IPC Main Group
C09B 50/00 Formazane dyes; Tetrazolium dyes
Introduced: July 1974
Last revised: January 2006
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
Filing statistics
IPC C09B 50/00 belongs to the parent subclass C09B, which recorded 27,838 patent applications worldwide between 2013 and 2023. Annual filings declined from 2,880 in 2013 to 1,697 in 2023 (-41%), peaking at 2,986 applications in 2014. The most active applicants in class C09 are LG CHEM (6,420 applications), NITTO DENKO CORPORATION (5,752 applications) and HALLIBURTON ENERGY SERVICES GROUP (5,650 applications).
Source: EPO PATSTAT, worldwide filings
5 direct subcodes
Child Classifications
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- C09B 50/02 Tetrazolium dyes
- C09B 50/04 Metal-free formazane dyes
- C09B 50/06 Bis-formazane dyes
- C09B 50/08 Meso-acyl formazane dyes
- C09B 50/1 Cationic formazane dyes
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