DIFF Subgroup
C10G 31/09 by filtration
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for > by filtration
CPC:
Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for (by distillation C10G7/00) > by filtration
No child classifications to compare. This is a leaf node in both IPC and CPC.