DIFF Subgroup
C01B 21/04 Purification or separation of nitrogen (by liquefying F25J)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Purification or separation of nitrogen
CPC: Purification or separation of nitrogen (by liquefying F25J)
Full Title
Full titles differ between systems:
IPC:
Nitrogen; Compounds thereof > Purification or separation of nitrogen
CPC:
Nitrogen; Compounds thereof > Purification or separation of nitrogen (by liquefying F25J)
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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