Top IPC subclasses
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1
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F03D
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18
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Wind motors
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2
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H02S
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7
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|
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3
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F03B
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4
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machines or engines for liquids
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4
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H01L
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2
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Semiconductor devices; electric solid state devices not otherwise provided for
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5
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F16H
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1
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gearing
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6
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F22B
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1
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methods of steam generationsteam boilers
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7
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F04B
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1
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positive-displacement machines for liquidspumps
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8
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F02B
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1
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Internal-combustion piston engines; combustion engines in general
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9
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G01L
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1
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measuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure
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10
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B29C
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1
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shaping or joining of plasticsshaping of substances in a plastic state, in generalafter- treatment o
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11
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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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12
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G01M
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1
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testing static or dynamic balance of machines or structurestesting structures or apparatus not other
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