Top IPC subclasses
1
|
C02F
|
375
|
Treatment of water, waste water, sewage, or sludge
|
2
|
C25B
|
119
|
Electrolytic or electrophoretic processes for the production of compounds or non- metals; apparatus therefor
|
3
|
B01J
|
88
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
4
|
B01D
|
79
|
Separation
|
5
|
C01B
|
35
|
non-metallic elementscompounds thereof
|
6
|
C01G
|
32
|
Compounds containing metals not covered by subclasses C01D or C01F
|
7
|
C25D
|
30
|
processes for the electrolytic or electrophoretic production of coatingselectroformingjoining workpi
|
8
|
C23C
|
29
|
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
|
9
|
C07C
|
28
|
Acyclic or carbocyclic compounds
|
10
|
C12P
|
26
|
fermentation or enzyme-using processes to synthesise a desired chemical compound or composition or t
|
11
|
A01N
|
22
|
Preservation of bodies of humans or animals or plants or parts thereof; biocides, e.g. as disinfectants, as pesticides or as herbicides; pest repellants or attractants; plant growth regulators
|
12
|
C12M
|
20
|
apparatus for enzymology or microbiology
|
13
|
B09B
|
19
|
disposal of solid waste
|
14
|
C01C
|
19
|
ammoniacyanogencompounds thereof
|
15
|
C12F
|
18
|
recovery of by-products of fermented solutionsdenaturing of, or denatured, alcohol
|
16
|
C25C
|
18
|
processes for the electrolytic production, recovery or refining of metalsapparatus therefor
|
17
|
A62D
|
17
|
chemical means for extinguishing firesprocesses for making harmful chemical substances harmless, or
|
18
|
F23C
|
12
|
methods or apparatus for combustion using fluent fuel
|
19
|
C22B
|
11
|
production or refining of metalspretreatment of raw materials
|
20
|
C05F
|
10
|
organic fertilisers not covered by subclasses , , e.g. fertilisers from waste or refuse
|