Inventor

Toshiaki Okuyama

Inventor

Tokai, JP

Overview

56→

Patents

1976–2011

Patent span

Electricity

Primary field (CPC H)

Patents· 56 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 converters49%

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 systems18%

H02KDynamo-electric machines5%

B60LPropulsion of electrically-propelled vehicles4%

B62DMotor vehicles4%

H02JElectric power networks4%

Y02TClimate change mitigation technologies related to transportation4%

B60KArrangement or mounting of propulsion units or of transmissions in vehicles1%

B60WConjoint control of vehicle sub-units of different type or different function1%

B60YIndexing scheme relating to aspects cross-cutting vehicle technology1%

PatentTitleYear

7,869,232'Electric power converter suppressing output voltage variation due to input voltage fluctuation'2011 7,671,558'Induction motor controller'2010 7,545,116'Driver for induction motor and method of driving the same'2009 7,332,888'Driving apparatus for a motor'2008 6,844,700'Inverter apparatus'2005 6,841,911'Machine tool'2005 6,741,063'Inverter apparatus'2004 6,704,212'PWM inverter with long carrier wave insertion'2004 6,670,786'Apparatus for controlling an induction motor'2003 6,657,412'Pulse width modulation method, pulse width modulator and power converter'2003 6,646,896'Controller of AC machine'2003 6,642,689'Control apparatus for power converter'2003 6,633,495'DC apparatus and vehicle using the same'2003 6,611,125'Method for calculating inertia moment and driver for electric motor'2003 6,556,464'PWM converter system'2003 6,556,460'Method for controlling a vehicle provided with an electric power converter'2003 6,496,397'Inverter device'2002 6,344,726'Method of controlling an induction motor'2002 6,300,741'Speed controlling method for induction motor'2001 6,229,719'Method of inverter control and apparatus of the same'2001 5,808,442'Method of charging a plurality of lithium ion rechargeable batteries'1998 5,475,293'Method for measuring characteristic constants of alternating current motor and controller thereof based on said method'1995 5,414,339'Electric vehicle control system'1995 5,355,749'Control apparatus and control method for motor drive vehicle'1994 5,033,565'Motor-driven power steering apparatus'1991 5,029,288'Method and apparatus for operating a variable speed power generation system'1991 5,016,158'Parallel multi-inverter system and motor drive system using the same'1991 4,960,178'Motor-driven power steering apparatus'1990 4,884,184'Control apparatus for cascaded converter circuit'1989 4,875,539'Electric power steering control system'1989 4,808,903'Vector control system for induction motors'1989 4,792,742'Control apparatus for an inverter with self-adjustment function of control constants'1988 4,764,859'Method and apparatus for controlling circulating-current type cycloconverter'1988 4,680,526'Method of controlling inverter-driven induction motor'1987 4,629,959'Method and apparatus for controlling PWM inverter'1986 4,625,272'Converter control apparatus and method'1986 4,562,397'Squirrel-cage induction motor'1985 4,524,310'Method and apparatus of controlling induction motors'1985 4,503,376'Control method for induction motors'1985 4,503,377'Variable speed rotary electric machine'1985 4,503,375'Method for controlling induction motor and apparatus therefor'1985 4,486,824'PWM Converter with control circuit responsive to minimum holding current'1984 4,459,534'Method for controlling induction motor and apparatus therefor'1984 4,344,025'Motor control system'1982 4,330,741'Electric control apparatus of induction motor'1982 4,328,454'Apparatus for controlling ac motor'1982 4,295,084'Control apparatus of synchronous motor having thyristor converter'1981 4,277,735'Control apparatus for induction motor'1981 4,276,504'Control device for commutatorless motor'1981 4,240,020'Control system for suppressing torque ripple in synchronous motor'1980 4,206,395'Harmonic eliminating apparatus'1980 4,132,931'Control system for a.c. motors'1979 4,125,796'Control apparatus for use in a synchronous machine'1978 4,088,932'Control system for commutatorless motor'1978 4,060,753'Control system for commutatorless motor'1977 3,949,283'Control system for brushless motor'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–2011Patents assigned to HITACHI LTD (53)· patent assignee history

1976–1982Based in Hitachi, JP· patent location history

1977–1995Based in Ibaraki, JP· patent location history

1981–2011Based in Tokai, JP· patent location history

1985–1995Based in Toukai, JP· patent location history

1989–1991Patents assigned to HITACHI AUTOMOTIVE ENG (3)· patent assignee history

1990–2004Based in Naka, JP· patent location history

1998Patents assigned to SANYO ELECTRIC CO (1)· patent assignee history

2004Patents assigned to HITACHI KEIYO ENGINEERING & SY (1)· patent assignee history

2009–2010Patents assigned to HITACHI IND EQUIPMENT SYS (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	53	1976–2011
HITACHI AUTOMOTIVE ENG	3	1989–1991
HITACHI IND EQUIPMENT SYS	2	2009–2010
HITACHI KEIYO ENGINEERING & SY	1	2004
SANYO ELECTRIC CO	1	1998

Locations

Location	Patents	Span
Tokai, JP	21	1981–2011
Ibaraki, JP	18	1977–1995
Hitachi, JP	9	1976–1982
Naka, JP	4	1990–2004
Toukai, JP	2	1985–1995