Top IPC subclasses
1
|
H01L
|
47
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
2
|
C30B
|
8
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
|
3
|
C01B
|
2
|
non-metallic elementscompounds thereof
|
4
|
C01G
|
2
|
Compounds containing metals not covered by subclasses C01D or C01F
|