Top IPC subclasses
|
1
|
C10L
|
11
|
fuels not otherwise provided fornatural gassynthetic natural gas obtained by processes not covered b
|
|
2
|
B01F
|
9
|
mixing, e.g. dissolving, emulsifying, dispersing
|
|
3
|
C07C
|
8
|
Acyclic or carbocyclic compounds
|
|
4
|
C12M
|
8
|
apparatus for enzymology or microbiology
|
|
5
|
C25B
|
8
|
Electrolytic or electrophoretic processes for the production of compounds or non- metals; apparatus therefor
|
|
6
|
B01D
|
7
|
Separation
|
|
7
|
C11C
|
5
|
fatty acids from fats, oils or waxescandlesfats, oils or fatty acids by chemical modification of fat
|
|
8
|
C02F
|
4
|
Treatment of water, waste water, sewage, or sludge
|
|
9
|
C11B
|
4
|
producing (pressing, extraction), refining or preserving fats, fatty substances (e.g. lanolin), fatt
|
|
10
|
C11D
|
4
|
detergent compositionsuse of single substances as detergentssoap or soap-makingresin soapsrecovery o
|
|
11
|
F17B
|
3
|
gas-holders of variable capacity
|
|
12
|
C12P
|
3
|
fermentation or enzyme-using processes to synthesise a desired chemical compound or composition or t
|
|
13
|
C10M
|
3
|
lubricating compositionsuse of chemical substances either alone or as lubricating ingredients in a l
|
|
14
|
F23C
|
2
|
methods or apparatus for combustion using fluent fuel
|
|
15
|
C01G
|
2
|
Compounds containing metals not covered by subclasses C01D or C01F
|
|
16
|
B01J
|
2
|
Chemical or physical processes, e.g. catalysis, colloid chemistry; their relevant apparatus
|
|
17
|
F17D
|
1
|
pipe-line systemspipe-lines
|
|
18
|
C10N
|
1
|
indexing scheme associated with subclass
|
|
19
|
F23B
|
1
|
methods or apparatus for combustion using only solid fuel
|
|
20
|
G01F
|
1
|
measuring volume, volume flow, mass flow, or liquid levelmetering by volume
|