Top IPC subclasses
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1
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G03G
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15
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Electrography; electrophotography; magnetography
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2
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G01B
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9
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measuring length, thickness, or similar linear dimensionsmeasuring anglesmeasuring areasmeasuring ir
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3
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G01N
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5
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Investigating or analysing materials by determining their chemical or physical properties
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4
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G01J
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3
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measurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics o
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5
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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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6
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C08F
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2
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macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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7
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B64C
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1
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aeroplaneshelicopters
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8
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G03B
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1
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apparatus or arrangements for taking photographs or for projecting or viewing themapparatus or arran
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9
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C23C
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1
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Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general
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