DIFF Subgroup
C01B 7/07 Purification
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Halogens; Halogen acids > Chlorine; Hydrogen chloride > Purification
CPC:
Halogens; Halogen acids (oxyacids C01B11/00) > Chlorine; Hydrogen chloride > Purification
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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