IPC Definitions - January 01, 2012
C09K 19/00 - Definition
Special rules of classification
In groups C09K 19/02-C09K 19/52, in the absence of an indication to the contrary, classification is made in the last appropriate place
Mixtures containing two or more liquid crystal compounds covered individually by the same one of groups C09K 19/04-C09K 19/40 are classified only in that group.
If liquid crystal components of the mixtures classified in groups C09K 19/42-C09K 19/50 are of importance as such, they should also be classified according to the compounds in groups C09K 19/04-C09K 19/40.