Top IPC subclasses
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1
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F03B
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3
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machines or engines for liquids
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2
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F01N
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2
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gas-flow silencers or exhaust apparatus for machines or engines in generalgas-flow silencers or exha
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3
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F03G
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2
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spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
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4
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F03D
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1
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Wind motors
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5
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H02K
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1
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dynamo-electric machines
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6
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H02N
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1
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electric machines not otherwise provided for
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7
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H01L
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1
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Semiconductor devices; electric solid state devices not otherwise provided for
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|
8
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G09B
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1
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educational or demonstration appliancesappliances for teaching, or communicating with, the blind, de
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9
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H04R
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1
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loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducersdeaf-ai
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|
10
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G01B
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1
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measuring length, thickness, or similar linear dimensionsmeasuring anglesmeasuring areasmeasuring ir
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