Inventor
Hidefumi Shirahama
Inventor
Hitachi, JP
Overview
Patents· 12 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 converters35%
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 systems30%
H02JElectric power networks20%
B60LPropulsion of electrically-propelled vehicles5%
H01RElectrically-conductive connections5%
Y02TClimate change mitigation technologies related to transportation5%
PatentTitleYear
8,421,395'Synchronous motor and control method of synchronous motor'20138,035,330'Apparatus and method for driving synchronous motor'20117,839,113'Apparatus and method for driving synchronous motor'20107,342,378'System and method for driving synchronous motor'20087,332,882'Motor drive device that combined charge controller'20087,148,651'Apparatus and method for controlling AC motor and module therefor'20067,075,266'Apparatus for controlling an a. c. motor'20066,954,050'Control method and control device of permanent-magnet type synchronous motor'20055,446,645'Inverter apparatus and uinterruptible power supply using the same'19955,297,015'Power supply control system'19945,262,935'Parallel inverter control apparatus'19935,115,386'Circuit for controlling an electric power supply apparatus, a method therefor and an uninterruptible power supply'1992Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1992–2013Patents assigned to HITACHI LTD (11)· patent assignee history
1992Patents assigned to HITACHI ENG CO LTD (1)· patent assignee history
1992–2013Based in Hitachi, JP· patent location history
2005Patents assigned to HITACHI IND EQUIPMENT SYS (1)· patent assignee history
2010–2013Patents assigned to HITACHI INF & CONTROL SYST (3)· patent assignee history
2013Patents assigned to HASEGAWA HIROYUKI (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 11 | 1992–2013 |
| HITACHI INF & CONTROL SYST | 3 | 2010–2013 |
| HASEGAWA HIROYUKI | 1 | 2013 |
| HITACHI ENG CO LTD | 1 | 1992 |
| HITACHI IND EQUIPMENT SYS | 1 | 2005 |
Locations
| Location | Patents | Span |
|---|---|---|
| Hitachi, JP | 12 | 1992–2013 |