DIFF Subgroup
C10G 21/04 by introducing simultaneously at least two immiscible solvents counter-current to each other
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents > with two or more solvents, which are introduced or withdrawn separately > by introducing simultaneously at least two immiscible solvents counter-current to each other
CPC:
Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents (C10G17/00, C10G19/00 take precedence) > with two or more solvents, which are introduced or withdrawn separately > by introducing simultaneously at least two immiscible solvents counter-current to each other
No child classifications to compare. This is a leaf node in both IPC and CPC.