Top IPC subclasses
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1
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E04B
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7
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General building constructions; walls, e.g. partitions; roofs; floors; ceilings; insulation or other protection of buildings
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2
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E04C
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4
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Structural elements; building materials
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3
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E02D
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4
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foundationsexcavationsembankmentsunderground or underwater structures
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4
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C09K
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3
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materials for applications not otherwise provided forapplications of materials not otherwise provide
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5
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F03C
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2
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positive-displacement engines driven by liquids
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6
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E04G
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2
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scaffoldingformsshutteringbuilding implements or other building aids, or their usehandling building
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7
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C04B
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2
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Lime; magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone; ceramics; refractories; treatment of natural stone
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8
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B06B
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1
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generating or transmitting mechanical vibrations in general
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9
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B28B
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1
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shaping clay or other ceramic compositions, slag or mixtures containing cementitious material, e.g.
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