Top IPC subclasses
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1
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B23H
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8
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Working of metal by the action of a high concentration of electric current on a workpiece using an electrode which takes the place of a tool; such working combined with other forms of working of metal
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2
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F16H
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5
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gearing
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3
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B23F
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5
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making gears or toothed racks
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4
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F24J
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5
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Production or use of heat not otherwise provided for
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5
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F03D
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3
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Wind motors
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6
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F03B
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3
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machines or engines for liquids
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7
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B23B
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2
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turningboring
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8
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B60K
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2
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arrangement or mounting of propulsion units or of transmissions in vehiclesarrangement or mounting o
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9
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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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10
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B29C
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2
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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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H01Q
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1
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aerials
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12
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E02B
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1
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hydraulic engineering
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13
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B66D
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1
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capstanswinchestackles, e.g. pulley blockshoists
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14
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B05C
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1
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apparatus for applying liquids or other fluent materials to surfaces, in general
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15
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F02G
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1
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hot-gas or combustion-product positive-displacement engine plantsuse of waste heat of combustion eng
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16
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B23K
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1
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soldering or unsolderingweldingcladding or plating by soldering or weldingcutting by applying heat l
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17
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E01F
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1
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additional work, such as equipping roads or the construction of platforms, helicopter landing stages
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