Top IPC subclasses
|
1
|
G03G
|
6
|
Electrography; electrophotography; magnetography
|
|
2
|
G08B
|
5
|
signalling or calling systemsorder telegraphsalarm systems
|
|
3
|
G01N
|
3
|
Investigating or analysing materials by determining their chemical or physical properties
|
|
4
|
G01T
|
2
|
measurement of nuclear or x-radiation
|
|
5
|
H01L
|
2
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
6
|
C03C
|
2
|
chemical composition of glasses, glazes, or vitreous enamelssurface treatment of glasssurface treatm
|
|
7
|
B82Y
|
2
|
|
|
8
|
G03H
|
1
|
holographic processes or apparatus
|
|
9
|
G02B
|
1
|
optical elements, systems, or apparatus
|
|
10
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
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