DIFF Subgroup
C09K 19/10 containing at least two benzene rings
Introduced: January 1985
Full Title
Liquid crystal materials > characterised by the chemical structure of the liquid crystal components > Non-steroidal liquid crystal compounds > containing at least two non-condensed rings > containing at least two benzene rings
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
IPC defines codes here since 1985.
Child Classifications
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- C09K 19/12 at least two benzene rings directly linked, e.g. biphenyls since 1985 +4 CPC IPC+CPC Available in IPC and CPC
- C09K 19/20 linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters since 1985 +1 CPC IPC+CPC Available in IPC and CPC
- C09K 19/22 linked by a chain containing carbon and nitrogen atoms as chain links, e.g. Schiff bases since 1985 IPC+CPC Available in IPC and CPC
- C09K 19/24 linked by a chain containing nitrogen-to-nitrogen bonds since 1985 IPC+CPC Available in IPC and CPC
- C09K 19/28 linked by a chain containing carbon and sulfur atoms as chain links, e.g. thioesters since 1985 IPC+CPC Available in IPC and CPC
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