characterised by the chemical structure of the liquid crystal components

Introduced: January 1985

Full Title

Liquid crystal materials > characterised by the chemical structure of the liquid crystal components

CPC subdivides this area 2x more granularly than IPC with 6 additional codes.

6 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

2 shared codes have differing titles between IPC and CPC.

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C09K 19/0403 +4 CPC CPC only CPC only
C09K 19/0422 CPC only CPC only
C09K 19/06 Non-steroidal liquid crystal compounds since 1985 +7 CPC IPC+CPC Available in IPC and CPC
C09K 19/36 Steroidal liquid crystal compounds since 1985 IPC+CPC Available in IPC and CPC
C09K 19/38 Polymers since 1985 +2 CPC IPC+CPC Available in IPC and CPC
C09K 19/40 containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, metals since 1985 +3 CPC IPC+CPC Available in IPC and CPC
C09K 19/42 Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 since 1985 IPC+CPC Available in IPC and CPC
C09K 2019/0425 2nd only +4 CPC CPC only CPC only
C09K 2019/0444 2nd only +8 CPC CPC only CPC only
C09K 2019/0477 2nd only +2 CPC CPC only CPC only
C09K 2019/0488 2nd only +2 CPC CPC only CPC only