DIFF Main Group
F25J 1/00 Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
Introduced: September 1968
CPC subdivides this area 4x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
Child Classifications
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- F25J 1/02 requiring the use of refrigeration, e.g. of helium or hydrogen +7 CPC IPC+CPC Available in IPC and CPC