DIFF Subgroup
B01D 21/30 Control equipment
Introduced: January 1985
Full Title
Full titles differ between systems:
IPC:
Separation of suspended solid particles from liquids by sedimentation > Control equipment
CPC:
Separation of suspended solid particles from liquids by sedimentation ( ; differential sedimentation B03D3/00; devices for separating or removing fatty or oily substances or similar floating material from water, waste water or sewage C02F1/40) > Control equipment
CPC subdivides this area 3x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
IPC defines codes here since 1985.
Child Classifications
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- B01D 21/32 Density control of clear liquid or sediment, e.g. optical control since 1985 IPC+CPC Available in IPC and CPC
- B01D 21/34 Controlling the feed distribution; Controlling the liquid level since 1985 IPC+CPC Available in IPC and CPC