Top IPC subclasses
1
|
B01J
|
13
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
2
|
C10M
|
13
|
lubricating compositionsuse of chemical substances either alone or as lubricating ingredients in a l
|
3
|
C10N
|
12
|
indexing scheme associated with subclass
|
4
|
B01D
|
3
|
Separation
|
5
|
C01B
|
2
|
non-metallic elementscompounds thereof
|