Top IPC subclasses
1
|
F03D
|
22
|
Wind motors
|
2
|
F04D
|
11
|
non-positive-displacement pumps
|
3
|
G01N
|
10
|
Investigating or analysing materials by determining their chemical or physical properties
|
4
|
A01G
|
8
|
Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
|
5
|
E04B
|
7
|
General building constructions; walls, e.g. partitions; roofs; floors; ceilings; insulation or other protection of buildings
|
6
|
F03B
|
6
|
machines or engines for liquids
|
7
|
G08B
|
4
|
signalling or calling systemsorder telegraphsalarm systems
|
8
|
F01D
|
4
|
non-positive-displacement machines or engines, e.g. steam turbines
|
9
|
G01V
|
4
|
geophysicsgravitational measurementsdetecting masses or objectstags
|
10
|
E04H
|
4
|
buildings or like structures for particular purposesswimming or splash baths or poolsmastsfencingten
|
11
|
A47G
|
3
|
household or table equipment
|
12
|
B65B
|
3
|
machines, apparatus or devices for, or methods of, packaging articles or materialsunpacking
|
13
|
F02C
|
3
|
gas-turbine plantsair intakes for jet-propulsion plantscontrolling fuel supply in air-breathing jet-
|
14
|
B65D
|
3
|
Containers for storage or transport of articles or materials, e.g. bags, barrels, bottles, boxes, cans, cartons, crates, drums, jars, tanks, hoppers, forwarding containers; accessories, closures, or fittings therefor; packaging elements; packages
|
15
|
F02K
|
2
|
jet-propulsion plants
|
16
|
F23L
|
2
|
air supplydraught-inducingsupplying non-combustible liquid or gas
|
17
|
H01L
|
2
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
18
|
F24H
|
2
|
fluid heaters, e.g. water or air heaters, having heat-generating means, in general
|
19
|
B64B
|
1
|
lighter-than-air aircraft
|
20
|
B63H
|
1
|
marine propulsion or steering
|