Top IPC subclasses
1
|
C02F
|
14
|
Treatment of water, waste water, sewage, or sludge
|
2
|
B01D
|
3
|
Separation
|
3
|
C12R
|
3
|
Indexing scheme associated with subclasses C12C-C12Q, relating to micro-organisms
|
4
|
C12N
|
3
|
Micro-organisms or enzymes; compositions thereof; propagating, preserving, or maintaining micro-organisms; mutation or genetic engineering; culture media
|
5
|
A62D
|
2
|
chemical means for extinguishing firesprocesses for making harmful chemical substances harmless, or
|