Top IPC subclasses
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1
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F24J
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7
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Production or use of heat not otherwise provided for
|
|
2
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A61N
|
6
|
electrotherapymagnetotherapyradiation therapyultrasound therapy
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|
3
|
H02H
|
5
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emergency protective circuit arrangements
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|
4
|
G01R
|
4
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Measuring electric variables; measuring magnetic variables
|
|
5
|
H03B
|
4
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generation of oscillations, directly or by frequency-changing, by circuits employing active elements
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|
6
|
F24H
|
3
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fluid heaters, e.g. water or air heaters, having heat-generating means, in general
|
|
7
|
F02G
|
3
|
hot-gas or combustion-product positive-displacement engine plantsuse of waste heat of combustion eng
|
|
8
|
G06F
|
2
|
electric digital data processing
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|
9
|
H01M
|
2
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processes or means, e.g. batteries, for the direct conversion of chemical energy into electrical ene
|
|
10
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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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|
11
|
F03G
|
2
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spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
|
|
12
|
H02N
|
1
|
electric machines not otherwise provided for
|
|
13
|
H01L
|
1
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
14
|
H02M
|
1
|
apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
|
|
15
|
F28D
|
1
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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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