Top IPC subclasses
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1
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H02M
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19
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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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B60L
|
11
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electric equipment or propulsion of electrically-propelled vehiclesmagnetic suspension or levitation
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|
3
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F02G
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10
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hot-gas or combustion-product positive-displacement engine plantsuse of waste heat of combustion eng
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|
4
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H02J
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9
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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|
5
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G05F
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5
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systems for regulating electric or magnetic variables
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|
6
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G01L
|
3
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measuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure
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|
7
|
G05D
|
2
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systems for controlling or regulating non-electric variables
|
|
8
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A61N
|
2
|
electrotherapymagnetotherapyradiation therapyultrasound therapy
|
|
9
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F02B
|
2
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Internal-combustion piston engines; combustion engines in general
|
|
10
|
H03B
|
2
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generation of oscillations, directly or by frequency-changing, by circuits employing active elements
|
|
11
|
F02N
|
1
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starting of combustion enginesstarting aids for such engines, not otherwise provided for
|
|
12
|
F24D
|
1
|
domestic- or space-heating systems, e.g. central heating systemsdomestic hot-water supply systemsele
|
|
13
|
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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