Inventor

Shigeta Ueda

Inventor

Hitachi, JP

Overview

23→

Patents

1985–2007

Patent span

Electricity

Primary field (CPC H)

Patents· 23 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H02Mprimary

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 systems33%

H03KPulse technique13%

G06FElectric digital data processing6%

B66BElevators4%

H02JElectric power networks4%

H02KDynamo-electric machines4%

H10DInorganic electric semiconductor devices4%

Y02TClimate change mitigation technologies related to transportation4%

B60LPropulsion of electrically-propelled vehicles2%

B61CLocomotives2%

PatentTitleYear

7,158,521'Synchronization system and synchronization method of multisystem control apparatus'2007 6,975,055'Dynamo-electric machine having a rotor with first and second axially or rotationally displaceable field magnets'2005 6,809,561'Semiconductor power converting apparatus'2004 6,727,516'Semiconductor power conversion apparatus'2004 6,717,177'Semiconductor power conversion apparatus'2004 6,703,874'Gate driver for MOS control semiconductor devices'2004 6,541,877'Wind power generation system'2003 6,490,182'Power conversion apparatus'2002 6,452,261'Flat semiconductor device and power converter employing the same'2002 6,389,041'Synchronization system and synchronization method of multisystem control apparatus'2002 6,304,468'Phase synchronization system for connecting a power converter to a power distribution system'2001 6,038,683'Replicated controller and fault recovery method thereof'2000 5,298,848'Large capacity variable speed PWM spatial vector type sub-harmonic system for driving AC electric motor'1994 4,965,504'Control apparatus for inverter for driving AC motor'1990 4,926,306'Electric power converter'1990 4,829,416'Apparatus for controlling power transducers of the pulse width modulation (PWM) control type'1989 4,787,021'Current-type converter apparatus'1988 4,779,709'Apparatus for controlling AC elevators'1988 4,757,436'Current-type converter protecting apparatus'1988 4,672,520'Current-source power converting apparatus with self-extinction devices'1987 4,599,685'Control circuit for power converter apparatus'1986 4,581,693'Apparatus for repeatedly applying short-circuit pulses to a current type inverter for output current control'1986 4,549,259'Gate control circuit for current-type inverter apparatus'1985

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1985–2007Patents assigned to HITACHI LTD (23)· patent assignee history

1985–2007Based in Hitachi, JP· patent location history

2001Patents assigned to HITACHI ENG SERVICE (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	23	1985–2007
HITACHI ENG SERVICE	1	2001

Locations

Location	Patents	Span
Hitachi, JP	23	1985–2007