Top IPC subclasses
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1
|
C23F
|
122
|
non-mechanical removal of metallic material from surfacesinhibiting corrosion of metallic materialin
|
|
2
|
B23H
|
96
|
Working of metal by the action of a high concentration of electric current on a workpiece using an electrode which takes the place of a tool; such working combined with other forms of working of metal
|
|
3
|
C07C
|
41
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Acyclic or carbocyclic compounds
|
|
4
|
G06K
|
31
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Recognition of data; presentation of data; record carriers; handling record carriers
|
|
5
|
C23C
|
21
|
Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general
|
|
6
|
C07F
|
12
|
acyclic, carbocyclic, or heterocyclic compounds containing elements other than carbon, hydrogen, hal
|
|
7
|
G01N
|
10
|
Investigating or analysing materials by determining their chemical or physical properties
|
|
8
|
B23K
|
10
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soldering or unsolderingweldingcladding or plating by soldering or weldingcutting by applying heat l
|
|
9
|
C25F
|
9
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processes for the electrolytic removal of materials from objectsapparatus therefor
|
|
10
|
C25D
|
6
|
processes for the electrolytic or electrophoretic production of coatingselectroformingjoining workpi
|
|
11
|
C01B
|
5
|
non-metallic elementscompounds thereof
|
|
12
|
C07D
|
4
|
Heterocyclic compounds
|
|
13
|
B23P
|
4
|
other working of metalcombined operationsuniversal machine tools
|
|
14
|
C01G
|
4
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
15
|
H02M
|
4
|
apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
|
|
16
|
C22C
|
3
|
alloys
|
|
17
|
B41M
|
3
|
printing, duplicating, marking, or copying processescolour printing
|
|
18
|
C21D
|
3
|
modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or n
|
|
19
|
H03K
|
2
|
pulse technique
|
|
20
|
C08H
|
1
|
derivatives of natural macromolecular compounds
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