Top IPC subclasses
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1
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G03C
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6
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photosensitive materials for photographic purposesphotographic processes, e.g. cine, x-ray, colour,
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|
2
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G03G
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4
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Electrography; electrophotography; magnetography
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|
3
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H01L
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3
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Semiconductor devices; electric solid state devices not otherwise provided for
|
|
4
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C08F
|
3
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macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
|
|
5
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C23F
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3
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non-mechanical removal of metallic material from surfacesinhibiting corrosion of metallic materialin
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|
6
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C01B
|
2
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non-metallic elementscompounds thereof
|
|
7
|
G02B
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2
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optical elements, systems, or apparatus
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|
8
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C01G
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2
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Compounds containing metals not covered by subclasses C01D or C01F
|
|
9
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C08G
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2
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macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsatu
|
|
10
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C23C
|
2
|
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
|
|
11
|
C07D
|
1
|
Heterocyclic compounds
|
|
12
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C07C
|
1
|
Acyclic or carbocyclic compounds
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|
13
|
G03H
|
1
|
holographic processes or apparatus
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|
14
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A01H
|
1
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New plants or processes for obtaining them; plant reproduction by tissue culture techniques
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|
15
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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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