Top IPC subclasses
1
|
H01L
|
3
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
2
|
B82B
|
2
|
nano-structuresmanufacture or treatment thereof
|
3
|
G02B
|
1
|
optical elements, systems, or apparatus
|
4
|
B02B
|
1
|
preparing grain for millingrefining granular fruit to commercial products by working the surface
|