Top IPC subclasses
1
|
B01J
|
7
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
2
|
C10M
|
4
|
lubricating compositionsuse of chemical substances either alone or as lubricating ingredients in a l
|
3
|
C10N
|
3
|
indexing scheme associated with subclass
|
4
|
H05H
|
2
|
plasma techniqueproduction of accelerated electrically- charged particles or of neutronsproduction o
|
5
|
C02F
|
1
|
Treatment of water, waste water, sewage, or sludge
|