DIFF Subgroup
F25J 3/0228 Full Title
Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification > by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream (F25J3/08 takes precedence )
Of 11 combined children, 0 exist in both systems.
11 codes are CPC-only extensions.