Inventor
Shigetoshi Okamatsu
Inventor
Katsuta, JP
Overview
Patents· 13 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H02Pprimary
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters39%
B60LPropulsion of electrically-propelled vehicles22%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems17%
Y02TClimate change mitigation technologies related to transportation17%
B60TVehicle brake control systems or parts thereof4%
PatentTitleYear
7,906,933'Apparatus and method for driving an induction motor'20117,869,232'Electric power converter suppressing output voltage variation due to input voltage fluctuation'20117,710,053'Motor driving system and motor driving method'20106,646,896'Controller of AC machine'20036,611,125'Method for calculating inertia moment and driver for electric motor'20034,825,131'Control system for induction motor driven electric car'19894,675,799'Control system for power converter'19874,672,525'Guard system for inverter apparatus'19874,490,666'Control of induction motor using PWM inverter'19844,338,558'Induction motor control system and method'19824,335,337'Control system for electric motor vehicle'19824,327,313'Control apparatus for electric car'19824,315,203'Control system for induction motor-driven car'1982Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1982–2011Patents assigned to HITACHI LTD (13)· patent assignee history
1982–1989Based in Katsuta, JP· patent location history
2003–2011Based in Hitachinaka, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 13 | 1982–2011 |
Locations
| Location | Patents | Span |
|---|---|---|
| Katsuta, JP | 8 | 1982–1989 |
| Hitachinaka, JP | 5 | 2003–2011 |