Top IPC subclasses
1
|
C01G
|
7
|
Compounds containing metals not covered by subclasses C01D or C01F
|
2
|
C09C
|
2
|
treatment of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling
|
3
|
C04B
|
1
|
Lime; magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone; ceramics; refractories; treatment of natural stone
|