DIFF Subgroup
C02F 1/54 using organic material
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Treatment of water, waste water, or sewage > by flocculation or precipitation of suspended impurities > using organic material
CPC:
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by flocculation or precipitation of suspended impurities > using organic material
CPC subdivides this area 4x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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