Top IPC subclasses
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1
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H02M
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11
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apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
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|
2
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A61N
|
8
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electrotherapymagnetotherapyradiation therapyultrasound therapy
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|
3
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H02J
|
8
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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|
4
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F24J
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7
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Production or use of heat not otherwise provided for
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|
5
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H03B
|
6
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generation of oscillations, directly or by frequency-changing, by circuits employing active elements
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|
6
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H02H
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5
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emergency protective circuit arrangements
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|
7
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A61P
|
5
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Specific therapeutic activity of chemical compounds or medicinal preparations
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|
8
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F24H
|
5
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fluid heaters, e.g. water or air heaters, having heat-generating means, in general
|
|
9
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G01R
|
4
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Measuring electric variables; measuring magnetic variables
|
|
10
|
H01L
|
4
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Semiconductor devices; electric solid state devices not otherwise provided for
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|
11
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F24S
|
4
|
|
|
12
|
H01F
|
3
|
magnetsinductancestransformersselection of materials for their magnetic properties
|
|
13
|
F03D
|
2
|
Wind motors
|
|
14
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G06F
|
2
|
electric digital data processing
|
|
15
|
H01M
|
2
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processes or means, e.g. batteries, for the direct conversion of chemical energy into electrical ene
|
|
16
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F03G
|
2
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spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
|
|
17
|
H02N
|
1
|
electric machines not otherwise provided for
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|
18
|
H05B
|
1
|
electric heatingelectric lighting not otherwise provided for
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|
19
|
G01N
|
1
|
Investigating or analysing materials by determining their chemical or physical properties
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|
20
|
B66F
|
1
|
hoisting, lifting, hauling, or pushing, not otherwise provided for, e.g. devices which apply a lifti
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