Top IPC subclasses
|
1
|
B01J
|
30
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
|
2
|
C02F
|
25
|
Treatment of water, waste water, sewage, or sludge
|
|
3
|
C10M
|
16
|
lubricating compositionsuse of chemical substances either alone or as lubricating ingredients in a l
|
|
4
|
C10N
|
14
|
indexing scheme associated with subclass
|
|
5
|
F23D
|
13
|
burners
|
|
6
|
B01D
|
13
|
Separation
|
|
7
|
F01N
|
13
|
gas-flow silencers or exhaust apparatus for machines or engines in generalgas-flow silencers or exha
|
|
8
|
C12N
|
8
|
Micro-organisms or enzymes; compositions thereof; propagating, preserving, or maintaining micro-organisms; mutation or genetic engineering; culture media
|
|
9
|
H05H
|
6
|
plasma techniqueproduction of accelerated electrically- charged particles or of neutronsproduction o
|
|
10
|
C25B
|
5
|
Electrolytic or electrophoretic processes for the production of compounds or non- metals; apparatus therefor
|
|
11
|
C12M
|
4
|
apparatus for enzymology or microbiology
|
|
12
|
H01L
|
4
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
|
13
|
C12R
|
4
|
Indexing scheme associated with subclasses C12C-C12Q, relating to micro-organisms
|
|
14
|
A23C
|
4
|
dairy products, e.g. milk, butter, cheesemilk or cheese substitutesmaking thereof
|
|
15
|
F23N
|
3
|
regulating or controlling combustion
|
|
16
|
E02B
|
2
|
hydraulic engineering
|
|
17
|
C08B
|
2
|
polysaccharidesderivatives thereof
|
|
18
|
C01B
|
2
|
non-metallic elementscompounds thereof
|
|
19
|
A01J
|
1
|
manufacture of dairy products
|
|
20
|
F23C
|
1
|
methods or apparatus for combustion using fluent fuel
|