Top IPC subclasses
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1
|
H01L
|
7
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
2
|
B01J
|
6
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
|
3
|
C01B
|
4
|
non-metallic elementscompounds thereof
|
|
4
|
B01D
|
3
|
Separation
|
|
5
|
B82B
|
2
|
nano-structuresmanufacture or treatment thereof
|
|
6
|
C01G
|
2
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
7
|
G01N
|
2
|
Investigating or analysing materials by determining their chemical or physical properties
|
|
8
|
G03H
|
1
|
holographic processes or apparatus
|
|
9
|
E01H
|
1
|
street cleaningcleaning of permanent wayscleaning beachescleaning landdispersing fog in general
|
|
10
|
E01C
|
1
|
construction of, or surfaces for, roads, sports grounds, or the likemachines or auxiliary tools for
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