• All sections
• H - Electricity
• H02P - Control or regulation of electric motors, electric generators or dynamo-electric converters; controlling transformers, reactors or choke coils
• H02P 7/20 - Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using multi-position switch, e.g. drum, controlling motor circuit by means of relays

Patent holdings for IPC class H02P 7/20

Total number of patents in this class: 6

10-year publication summary

Principal owners for this class