Top IPC subclasses
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1
|
H01L
|
5
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
2
|
G03C
|
4
|
photosensitive materials for photographic purposesphotographic processes, e.g. cine, x-ray, colour,
|
|
3
|
C23F
|
3
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non-mechanical removal of metallic material from surfacesinhibiting corrosion of metallic materialin
|
|
4
|
G03H
|
2
|
holographic processes or apparatus
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|
5
|
C23C
|
2
|
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
|
|
6
|
C01B
|
1
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non-metallic elementscompounds thereof
|
|
7
|
G02B
|
1
|
optical elements, systems, or apparatus
|
|
8
|
G03G
|
1
|
Electrography; electrophotography; magnetography
|
|
9
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C01G
|
1
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Compounds containing metals not covered by subclasses C01D or C01F
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