Patent Classification Explorer PCE

DIFF Subgroup

C09K 19/52

characterised by components which are not liquid crystals, e.g. additives

Introduced: January 1985

Full Title

Liquid crystal materials > characterised by components which are not liquid crystals, e.g. additives

CPC subdivides this area 3x more granularly than IPC with 5 additional codes.

5 codes are CPC-only extensions.

Note: 5 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1985.

Child Classifications

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C09K 19/54 Additives having no specific mesophase since 1985 +1 CPC IPC+CPC Available in IPC and CPC
C09K 19/58 Dopants or charge transfer agents since 1985 +2 CPC IPC+CPC Available in IPC and CPC
C09K 19/60 Pleochroic dyes since 1985 +5 CPC IPC+CPC Available in IPC and CPC
C09K 2019/521 2nd only CPC only CPC only
C09K 2019/523 2nd only CPC only CPC only
C09K 2019/525 2nd only CPC only CPC only
C09K 2019/526 2nd only CPC only CPC only
C09K 2019/528 2nd only CPC only CPC only