Top IPC subclasses
1
|
C10M
|
6
|
lubricating compositionsuse of chemical substances either alone or as lubricating ingredients in a l
|
2
|
C10N
|
1
|
indexing scheme associated with subclass
|
3
|
C13D
|
1
|
production or purification of sugar juices
|
4
|
C02F
|
1
|
Treatment of water, waste water, sewage, or sludge
|