Top IPC subclasses
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1
|
B01J
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17
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Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
|
2
|
C23C
|
17
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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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|
3
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C25B
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15
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Electrolytic or electrophoretic processes for the production of compounds or non- metals; apparatus therefor
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|
4
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C02F
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6
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Treatment of water, waste water, sewage, or sludge
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|
5
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C22C
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5
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alloys
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6
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B01D
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5
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Separation
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|
7
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C01B
|
3
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non-metallic elementscompounds thereof
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|
8
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C01G
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2
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Compounds containing metals not covered by subclasses C01D or C01F
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|
9
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B82B
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1
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nano-structuresmanufacture or treatment thereof
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|
10
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C25D
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1
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processes for the electrolytic or electrophoretic production of coatingselectroformingjoining workpi
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|
11
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C04B
|
1
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Lime; magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone; ceramics; refractories; treatment of natural stone
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