Top IPC subclasses
1
|
H02M
|
24
|
apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
|
2
|
H01L
|
19
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
3
|
F24S
|
14
|
|
4
|
F03D
|
13
|
Wind motors
|
5
|
H02S
|
12
|
|
6
|
H01F
|
6
|
magnetsinductancestransformersselection of materials for their magnetic properties
|
7
|
H02J
|
6
|
circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
|
8
|
A01G
|
5
|
Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
|
9
|
F24J
|
4
|
Production or use of heat not otherwise provided for
|
10
|
F24H
|
3
|
fluid heaters, e.g. water or air heaters, having heat-generating means, in general
|
11
|
H02P
|
3
|
control or regulation of electric motors, generators, or dynamo-electric converterscontrolling trans
|
12
|
F21S
|
2
|
non-portable lighting devices or systems thereof
|
13
|
H05B
|
2
|
electric heatingelectric lighting not otherwise provided for
|
14
|
B23K
|
2
|
soldering or unsolderingweldingcladding or plating by soldering or weldingcutting by applying heat l
|
15
|
F24D
|
2
|
domestic- or space-heating systems, e.g. central heating systemsdomestic hot-water supply systemsele
|
16
|
C25B
|
2
|
Electrolytic or electrophoretic processes for the production of compounds or non- metals; apparatus therefor
|
17
|
F03B
|
1
|
machines or engines for liquids
|
18
|
F03C
|
1
|
positive-displacement engines driven by liquids
|
19
|
G01R
|
1
|
Measuring electric variables; measuring magnetic variables
|
20
|
F26B
|
1
|
Drying solid materials or objects by removing liquid therefrom
|