Top IPC subclasses
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1
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F28D
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4
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heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do n
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2
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F03B
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2
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machines or engines for liquids
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3
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H02N
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2
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electric machines not otherwise provided for
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4
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F04B
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2
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positive-displacement machines for liquidspumps
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5
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F28F
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2
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details of heat-exchange or heat-transfer apparatus, of general application
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6
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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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