Top IPC subclasses
1
|
F03D
|
11
|
Wind motors
|
2
|
H02S
|
3
|
|
3
|
B63H
|
2
|
marine propulsion or steering
|
4
|
H01L
|
2
|
Semiconductor devices; electric solid state devices not otherwise provided for
|
5
|
G08B
|
1
|
signalling or calling systemsorder telegraphsalarm systems
|
6
|
H02P
|
1
|
control or regulation of electric motors, generators, or dynamo-electric converterscontrolling trans
|