Top IPC subclasses
1
|
F03D
|
3
|
Wind motors
|
2
|
F24J
|
2
|
Production or use of heat not otherwise provided for
|
3
|
B60K
|
2
|
arrangement or mounting of propulsion units or of transmissions in vehiclesarrangement or mounting o
|
4
|
F03G
|
2
|
spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
|
5
|
F02G
|
1
|
hot-gas or combustion-product positive-displacement engine plantsuse of waste heat of combustion eng
|