Top IPC subclasses
|
1
|
C07D
|
4
|
Heterocyclic compounds
|
|
2
|
G02B
|
3
|
optical elements, systems, or apparatus
|
|
3
|
G03G
|
3
|
Electrography; electrophotography; magnetography
|
|
4
|
C08F
|
3
|
macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
|
|
5
|
C08L
|
2
|
Compositions of macromolecular compounds
|
|
6
|
C30B
|
2
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
|
|
7
|
C08G
|
2
|
macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsatu
|
|
8
|
G03C
|
2
|
photosensitive materials for photographic purposesphotographic processes, e.g. cine, x-ray, colour,
|
|
9
|
C07C
|
1
|
Acyclic or carbocyclic compounds
|
|
10
|
C01B
|
1
|
non-metallic elementscompounds thereof
|
|
11
|
C08C
|
1
|
treatment or chemical modification of rubbers
|
|
12
|
A61K
|
1
|
Preparations for medical, dental, or toilet purposes
|
|
13
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
14
|
A61P
|
1
|
Specific therapeutic activity of chemical compounds or medicinal preparations
|