Top IPC subclasses
1
|
C02F
|
4
|
Treatment of water, waste water, sewage, or sludge
|
2
|
B01J
|
2
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
3
|
C25D
|
1
|
processes for the electrolytic or electrophoretic production of coatingselectroformingjoining workpi
|