Top IPC subclasses
1
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B01D
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1
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Separation
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2
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C01B
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1
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non-metallic elementscompounds thereof
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3
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H01L
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1
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Semiconductor devices; electric solid state devices not otherwise provided for
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4
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C23C
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1
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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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