Top IPC subclasses
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1
|
C07C
|
8
|
Acyclic or carbocyclic compounds
|
|
2
|
C09K
|
7
|
materials for applications not otherwise provided forapplications of materials not otherwise provide
|
|
3
|
C08L
|
6
|
Compositions of macromolecular compounds
|
|
4
|
B82Y
|
6
|
|
|
5
|
G08B
|
5
|
signalling or calling systemsorder telegraphsalarm systems
|
|
6
|
G03G
|
4
|
Electrography; electrophotography; magnetography
|
|
7
|
C01G
|
4
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
8
|
C07F
|
4
|
acyclic, carbocyclic, or heterocyclic compounds containing elements other than carbon, hydrogen, hal
|
|
9
|
G03C
|
4
|
photosensitive materials for photographic purposesphotographic processes, e.g. cine, x-ray, colour,
|
|
10
|
G02B
|
3
|
optical elements, systems, or apparatus
|
|
11
|
B82B
|
3
|
nano-structuresmanufacture or treatment thereof
|
|
12
|
C07D
|
2
|
Heterocyclic compounds
|
|
13
|
C01B
|
2
|
non-metallic elementscompounds thereof
|
|
14
|
C30B
|
2
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
|
|
15
|
C08C
|
1
|
treatment or chemical modification of rubbers
|
|
16
|
H01L
|
1
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
17
|
C03C
|
1
|
chemical composition of glasses, glazes, or vitreous enamelssurface treatment of glasssurface treatm
|
|
18
|
C01F
|
1
|
compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium
|
|
19
|
C23C
|
1
|
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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