Top IPC subclasses
1
|
H01L
|
39
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
2
|
C22B
|
6
|
production or refining of metalspretreatment of raw materials
|
3
|
C30B
|
4
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
|
4
|
B09B
|
2
|
disposal of solid waste
|
5
|
C01B
|
2
|
non-metallic elementscompounds thereof
|
6
|
C01G
|
2
|
Compounds containing metals not covered by subclasses C01D or C01F
|
7
|
C23C
|
1
|
Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general
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