Top IPC subclasses
|
1
|
H01L
|
28
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
2
|
B82B
|
23
|
nano-structuresmanufacture or treatment thereof
|
|
3
|
G02B
|
8
|
optical elements, systems, or apparatus
|
|
4
|
B82Y
|
7
|
|
|
5
|
C01B
|
5
|
non-metallic elementscompounds thereof
|
|
6
|
C30B
|
5
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
|
|
7
|
H01S
|
4
|
devices using stimulated emission
|
|
8
|
C01F
|
4
|
compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium
|
|
9
|
C01G
|
3
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
10
|
C25D
|
3
|
processes for the electrolytic or electrophoretic production of coatingselectroformingjoining workpi
|
|
11
|
B81C
|
3
|
processes or apparatus specially adapted for the manufacture or treatment of micro-structural device
|
|
12
|
B01D
|
2
|
Separation
|
|
13
|
C25F
|
2
|
processes for the electrolytic removal of materials from objectsapparatus therefor
|
|
14
|
G01N
|
2
|
Investigating or analysing materials by determining their chemical or physical properties
|
|
15
|
G11C
|
1
|
static stores
|
|
16
|
C07C
|
1
|
Acyclic or carbocyclic compounds
|
|
17
|
C22B
|
1
|
production or refining of metalspretreatment of raw materials
|
|
18
|
B02C
|
1
|
crushing, pulverising, or disintegrating in generalmilling grain
|
|
19
|
C01D
|
1
|
compounds of alkali metals, i.e. lithium, sodium, potassium, rubidium, caesium, or francium
|
|
20
|
B02B
|
1
|
preparing grain for millingrefining granular fruit to commercial products by working the surface
|