Inventor
Takayuki Yamakawa
Inventor
Fukuoka, JP
Overview
Patents· 5 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 converters25%
Y02PClimate change mitigation technologies in the production or processing of goods25%
B66CCranes13%
E02FDredging13%
F04BPositive-displacement machines for liquids13%
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 systems13%
PatentTitleYear
6,599,095'Pump-off control method of pump jack'20036,121,748'Method and apparatus for controlling an induction motor'20005,938,052'Rope steadying control method and apparatus for crane or the like'19995,731,682'Control unit and control method for motors'19985,488,787'Hydraulic drive system for construction machine'1996Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1996Patents assigned to HITACHI CONSTRUCTION MACHINERY (1)· patent assignee history
1996Based in Ibaraki, JP· patent location history
1998–2003Patents assigned to YASKAWA DENKI SEISAKUSHO KK (4)· patent assignee history
1998–2003Based in Fukuoka, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| YASKAWA DENKI SEISAKUSHO KK | 4 | 1998–2003 |
| HITACHI CONSTRUCTION MACHINERY | 1 | 1996 |
Locations
| Location | Patents | Span |
|---|---|---|
| Fukuoka, JP | 4 | 1998–2003 |
| Ibaraki, JP | 1 | 1996 |