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