Top IPC subclasses
1
|
B03C
|
5
|
magnetic or electrostatic separation of solid materials from solid materials or fluidsseparation by
|
2
|
G01N
|
4
|
Investigating or analysing materials by determining their chemical or physical properties
|
3
|
B01J
|
2
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
4
|
B64C
|
1
|
aeroplaneshelicopters
|