Inventor · disambiguated record
Naoki Kumagai
Also filed as: KUMAGAI NAOKI
49 granted patents·5 pending applications·678 citations·filing 1974–2024
98Inventor score
Files withFUJI ELECTRIC CO LTD39FUJI ELEC DEVICE TECH CO LTD4AMP INC2HITACHI LTD2ITOGIHAN COMPANY LTD2
Top patents by PatentIndex Score
54 records- 0194US6570413B1Driver circuit for switching deviceFUJI ELECTRIC CO LTD·Filed 2000·Granted May 27, 2003·61 cites·9 claims
- 0290US9825025B2Semiconductor device and method of manufacturing semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2017·Granted Nov 21, 2017·7 cites·17 claims
- 0388US5896043ALevel shift circuitFUJI ELECTRIC CO LTD·Filed 1997·Granted Apr 20, 1999·59 cites·17 claims
- 0486US6326831B1Level shift circuitFUJI ELECTRIC CO LTD·Filed 2000·Granted Dec 4, 2001·29 cites·9 claims
- 0584US6501321B2Level shift circuitFUJI ELECTRIC CO LTD·Filed 2001·Granted Dec 31, 2002·24 cites·2 claims
- 0683US7436024B2Semiconductor device and method of manufacturing the sameFUJI ELEC DEVICE TECH CO LTD·Filed 2005·Granted Oct 14, 2008·11 cites·11 claims
- 0783US5304802ASemiconductor device including overvoltage protective circuitFUJI ELECTRIC CO LTD·Filed 1993·Granted Apr 19, 1994·55 cites·8 claims
- 0882US10770581B2Semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2019·Granted Sep 8, 2020·3 cites·6 claims
- 0981US6977425B2Semiconductor device having a lateral MOSFET and combined IC using the sameFUJI ELECTRIC CO LTD·Filed 2003·Granted Dec 20, 2005·24 cites·14 claims
- 1081US6323539B1High voltage integrated circuit, high voltage junction terminating structure, and high voltage MIS transistorFUJI ELECTRIC CO LTD·Filed 2000·Granted Nov 27, 2001·34 cites·43 claims
- 1180US9595608B2Semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2015·Granted Mar 14, 2017·3 cites·20 claims
- 1279US9349855B2Wide band gap semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2013·Granted May 24, 2016·4 cites·12 claims
- 1377US10522672B2Semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2018·Granted Dec 31, 2019·2 cites·13 claims
- 1477US9318547B2Wide bandgap insulated gate semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2015·Granted Apr 19, 2016·2 cites·3 claims
- 1577US8217704B2Gate drive deviceKOHAMA TAKANORI·Filed 2010·Granted Jul 10, 2012·6 cites·15 claims
- 1675US9093493B2Wide bandgap insulated gate semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2014·Granted Jul 28, 2015·3 cites·5 claims
- 1775US6124628AHigh voltage integrated circuit, high voltage junction terminating structure, and high voltage MIS transistorFUJI ELECTRIC CO LTD·Filed 1996·Granted Sep 26, 2000·52 cites·16 claims
- 1874US6870223B2High power semiconductor device having a Schottky barrier diodeFUJI ELECTRIC CO LTD·Filed 2002·Granted Mar 22, 2005·18 cites·12 claims
- 1972US6934139B2Intelligent power moduleFUJI ELEC DEVICE TECH CO LTD·Filed 2001·Granted Aug 23, 2005·17 cites·19 claims
- 2070US7476935B2High power semiconductor device having a schottky barrier diodeFUJI ELECTRIC CO LTD·Filed 2005·Granted Jan 13, 2009·4 cites·5 claims
- 2170US3955686AApparatus for supplying thin, flat articlesITOGIHAN COMPANY LTD·Filed 1975·Granted May 11, 1976·16 cites·4 claims
- 2269US10096680B2Silicon carbide semiconductor device and method of manufacturing silicon carbide semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2017·Granted Oct 9, 2018·1 cites·18 claims
- 2369US5430323AInjection control-type Schottky barrier rectifierFUJI ELECTRIC CO LTD·Filed 1993·Granted Jul 4, 1995·29 cites·12 claims
- 2467US5303110AInsulated-gate controlled semiconductor deviceFUJI ELECTRIC CO LTD·Filed 1992·Granted Apr 12, 1994·26 cites·12 claims
- 2567US2025209378A1Machine learning system and machine learning methodPRIME PLANET ENERGY & SOLUTIONS INC·Filed 2024·Application pending·0 cites
- 2666US9390843B2Input circuit includes a constant current circuitFUJI ELECTRIC CO LTD·Filed 2014·Granted Jul 12, 2016·2 cites·8 claims
- 2763US7247923B2Semiconductor device having a lateral MOSFET and combined IC using the sameFUJI ELECTRIC CO LTD·Filed 2005·Granted Jul 24, 2007·2 cites·15 claims
- 2863US3967739AApparatus for supplying thin, flat articlesITOGIHAN COMPANY LTD·Filed 1974·Granted Jul 6, 1976·12 cites·10 claims
- 2963US2025159961A1Semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2024·Application pending·0 cites
- 3061US7723817B2Semiconductor device and manufacturing method thereofFUJI ELEC DEVICE TECH CO LTD·Filed 2006·Granted May 25, 2010·1 cites·6 claims
- 3159US5585650ASemiconductor bidirectional switch and method of driving the sameFUJI ELECTRIC CO LTD·Filed 1995·Granted Dec 17, 1996·19 cites·4 claims
- 3257US5844760AInsulated-gate controlled semiconductor deviceFUJI ELECTRIC CO LTD·Filed 1993·Granted Dec 1, 1998·18 cites·11 claims
- 3356US7602022B2Surge voltage protection diode with controlled p-n junction density gradientsFUJI ELEC DEVICE TECH CO LTD·Filed 2006·Granted Oct 13, 2009·2 cites·5 claims
- 3456US2023246102A1Superjunction semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2023·Application pending·0 cites
- 3556US2025211213A1Pulse current application device and control method of pulse current application deviceFUJI ELECTRIC CO LTD·Filed 2024·Application pending·0 cites
- 3654US5475333ABuilt-in drive power-source semiconductor deviceFUJI ELECTRIC CO LTD·Filed 1993·Granted Dec 12, 1995·27 cites·36 claims
- 3754US2023236239A1Gate voltage determination apparatus, gate voltage determination method, gate driving circuit and semiconductor circuitFUJI ELECTRIC CO LTD·Filed 2022·Application pending·0 cites
- 3851US9761705B2Wide band gap semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2016·Granted Sep 12, 2017·0 cites·5 claims
- 3950US6501814B1Dry radioactive substance storage facilityHITACHI LTD·Filed 2001·Granted Dec 31, 2002·1 cites·8 claims
- 4050US5925900AEmitter-switched thyristor having a floating ohmic contactFUJI ELECTRIC CO LTD·Filed 1995·Granted Jul 20, 1999·13 cites·19 claims
- 4150US5380190APulse combustorPALOMA KOGYO KK·Filed 1993·Granted Jan 10, 1995·14 cites·15 claims
- 4249US11538902B2Silicon carbide semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2021·Granted Dec 27, 2022·0 cites·3 claims
- 4349US4984996APrinted circuit board edge connectorAMP INC·Filed 1990·Granted Jan 15, 1991·15 cites·5 claims
- 4448US10451665B2Pulse current application circuit and control method thereofFUJI ELECTRIC CO LTD·Filed 2018·Granted Oct 22, 2019·0 cites·8 claims
- 4547US5051808ASemiconductor device with low inductance of wirings connecting individual elements of the deviceFUJI ELECTRIC CO LTD·Filed 1990·Granted Sep 24, 1991·11 cites·18 claims
- 4645US10770582B2Semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2019·Granted Sep 8, 2020·0 cites·7 claims
- 4744US10147797B2Silicon carbide semiconductor device and method of manufacturing silicon carbide semiconductor deviceFUJI ELECTRIC CO LTD·Filed 2017·Granted Dec 4, 2018·0 cites·6 claims
- 4844US5477077ASemiconductor device and a method for the manufacture thereofFUJI ELECTRIC CO LTD·Filed 1993·Granted Dec 19, 1995·9 cites·9 claims
- 4944US5374203AEdge connector and board latching device for a connectorWHITAKER CORP·Filed 1994·Granted Dec 20, 1994·9 cites·36 claims
- 5043US5744830ASemiconductor deviceFUJI ELECTRIC CO LTD·Filed 1995·Granted Apr 28, 1998·11 cites·13 claims
Showing the top 50 of 54 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →