Top IPC subclasses
1
|
C01F
|
3
|
compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium
|
2
|
C07C
|
2
|
Acyclic or carbocyclic compounds
|
3
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
|
4
|
C07F
|
1
|
acyclic, carbocyclic, or heterocyclic compounds containing elements other than carbon, hydrogen, hal
|