Methine or polymethine dyes, e.g. cyanine dyes

Introduced: September 1968

Of 10 combined children, 5 exist in both systems.

4 codes are CPC-only extensions, 1 exist only in IPC.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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C09B 23/0008 +5 CPC CPC only CPC only
C09B 23/0066 CPC only CPC only
C09B 23/0075 +1 CPC CPC only CPC only
C09B 23/0091 CPC only CPC only
C09B 23/01 characterised by the methine chain since 1980 IPC only IPC only
C09B 23/02 the polymethine chain containing an odd number of >CH- groups IPC+CPC Available in IPC and CPC
C09B 23/10 The polymethine chain containing an even number of >CH- groups +3 CPC IPC+CPC Available in IPC and CPC
C09B 23/12 the polymethine chain being branched IPC+CPC Available in IPC and CPC
C09B 23/14 Styryl dyes +4 CPC IPC+CPC Available in IPC and CPC
C09B 23/16 the polymethine chain containing hetero atoms +2 CPC IPC+CPC Available in IPC and CPC

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

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