Top IPC subclasses
1
|
C02F
|
12
|
Treatment of water, waste water, sewage, or sludge
|
2
|
B01D
|
3
|
Separation
|
3
|
C08L
|
2
|
Compositions of macromolecular compounds
|
4
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
|
5
|
B01J
|
1
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|