Top IPC subclasses
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1
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F24S
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5
|
|
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2
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H01L
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4
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Semiconductor devices; electric solid state devices not otherwise provided for
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3
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B01D
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3
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Separation
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4
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F24H
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2
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fluid heaters, e.g. water or air heaters, having heat-generating means, in general
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5
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H02J
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2
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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6
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G09B
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2
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educational or demonstration appliancesappliances for teaching, or communicating with, the blind, de
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7
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H02S
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2
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|
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8
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F24J
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1
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Production or use of heat not otherwise provided for
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9
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C10C
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1
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working-up tar, pitch, asphalt, bitumenpyroligneous acid
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10
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B03B
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1
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separating solid materials using liquids or using pneumatic tables or jigs
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11
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A01G
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1
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Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
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