Inventor
ISHIKAWA KATSUMI
JP55 patents
⚠️ This page may combine multiple inventors who share the name “ISHIKAWA KATSUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
25 patentsUS7671465B2Mar 2, 2010
Power semiconductor module
HITACHI LTD24 citations92
US7570085B2Aug 4, 2009
Gate driver circuit for switching device
HITACHI LTD37 citations92
US7547966B2Jun 16, 2009
Power semiconductor module
HITACHI LTD47 citations92
US7126802B2Oct 24, 2006
Drive circuit for switching device
HITACHI LTD13 citations92
US6759964B2Jul 6, 2004
Fault detection system
HITACHI LTD17 citations92
US6724313B2Apr 20, 2004
Fault detection system
HITACHI LTD31 citations92
US5883403AMar 16, 1999
Power semiconductor device
HITACHI LTD29 citations92
US7737761B2Jun 15, 2010
Gate drive circuit with reduced switching loss and noise
HITACHI LTD29 citations91
US7783396B2Aug 24, 2010
Hybrid cruising control system
HITACHI LTD13 citations84
US7746614B2Jun 29, 2010
Drive circuit for switching device
HITACHI LTD9 citations84
US7483250B2Jan 27, 2009
Drive circuit for switching device
HITACHI LTD10 citations84
US7352184B2Apr 1, 2008
MRI apparatus with high-resistance magnet
HITACHI LTD10 citations84
US7295412B2Nov 13, 2007
Protection circuit for power management semiconductor devices and power converter having the protection circuit
HITACHI LTD13 citations84
US7880174B2Feb 1, 2011
Circuit arrangement having a free-wheel diode
HITACHI LTD10 citations83
US7046155B2May 16, 2006
Fault detection system
HITACHI LTD8 citations74
US7806991B2Oct 5, 2010
Low loss magnet and magnetic circuit using the same
HITACHI LTD3 citations63
US7696650B2Apr 13, 2010
Driving circuit for switching elements
HITACHI LTD2 citations63
US7675727B2Mar 9, 2010
Protection circuit for power management semiconductor devices and power converter having the protection circuit
HITACHI LTD5 citations63
US7564294B2Jul 21, 2009
Inverter apparatus
HITACHI LTD2 citations63
US7336118B2Feb 26, 2008
Inverter apparatus
HITACHI LTD3 citations63
US9171831B2Oct 27, 2015
Power semiconductor with a Si chip and a wideband chip having matched loss and area ratios
HITACHI LTD2 citations62
US8860170B2Oct 14, 2014
Power semiconductor with a Si chip and a wideband chip having matched loss and area ratios
HITACHI LTD2 citations62
US7954334B2Jun 7, 2011
Inverter system and vehicle
HITACHI LTD6 citations62
US7994826B2Aug 9, 2011
Drive circuit for power semiconductor switching device
HITACHI LTD6 citations61
US7847555B2Dec 7, 2010
MRI apparatus with high-resistance magnet
HITACHI LTD0 citations52
YAMAHA CORP
6 patentsUS10885806B2Jan 5, 2021
Musical score processing method and musical score processing system
YAMAHA CORP0 citations62
US10204617B2Feb 12, 2019
Voice synthesis method and voice synthesis device
YAMAHA CORP1 citations62
US12288546B2Apr 29, 2025
Live data distribution method, live data distribution system, and live data distribution apparatus
YAMAHA CORP0 citations60
US12542146B2Feb 3, 2026
Sound processing method, sound processing apparatus and sound processing system
YAMAHA CORP0 citations56
US12598366B2Apr 7, 2026
Content data processing method and content data processing apparatus
YAMAHA CORP0 citations49
US12342151B2Jun 24, 2025
Live data distribution method, live data distribution system, and live data distribution apparatus
YAMAHA CORP0 citations49
NIHON PLAST CO LTD
3 patentsISHIKAWA KATSUMI
3 patentsUS8508258B2Aug 13, 2013
Driver circuit for switching device
ISHIKAWA KATSUMI22 citations91
US8471622B2Jun 25, 2013
Drive circuit of semiconductor device
ISHIKAWA KATSUMI13 citations82
US8441075B2May 14, 2013
Power semiconductor apparatus having a silicon power semiconductor device and a wide gap semiconductor device
ISHIKAWA KATSUMI7 citations82
DENSO CORP
2 patentsOGAWA KAZUTOSHI
2 patentsWAKO GIKEN CO LTD
2 patentsPIONEER ELECTRONIC CORP
2 patentsUNIDEN KK
1 patentHATANAKA AYUMU
1 patentAYANO HIDEKI
1 patentKYOWA ELECTRONIC INSTRUMENTS
1 patentNIHON TRIM CO LTD
1 patentShowing the top 50 of 55 patents by PatentIndex Score.