Inventor
YATSUO TSUTOMU
41 patents
⚠️ This page may combine multiple inventors who share the name “YATSUO TSUTOMU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
32 patentsUS6353236B1Mar 5, 2002
Semiconductor surge absorber, electrical-electronic apparatus, and power module using the same
HITACHI LTD52 citations96
US5736753AApr 7, 1998
Semiconductor device for improved power conversion having a hexagonal-system single-crystal silicon carbide
HITACHI LTD71 citations95
US4100562AJul 11, 1978
Light coupled semiconductor device and method of manufacturing the same
HITACHI LTD51 citations93
US6169672B1Jan 2, 2001
Power converter with clamping circuit
HITACHI LTD40 citations92
US5021855AJun 4, 1991
Gate turn-off thyristor
HITACHI LTD22 citations91
US4388635AJun 14, 1983
High breakdown voltage semiconductor device
HITACHI LTD19 citations82
US4016593AApr 5, 1977
Bidirectional photothyristor device
HITACHI LTD28 citations82
US6566726B1May 20, 2003
Semiconductor device and power converter using the same
HITACHI LTD18 citations80
US4626888ADec 2, 1986
Gate turn-off thyristor
HITACHI LTD11 citations74
US4500903AFeb 19, 1985
Semiconductor GTO switching device with radially elongated cathode emitter regions of increasing length
HITACHI LTD8 citations74
US4443810AApr 17, 1984
Gate turn-off amplified thyristor with non-shorted auxiliary anode
HITACHI LTD15 citations74
US4216487AAug 5, 1980
Bidirectional light-activated thyristor having substrate optical isolation
HITACHI LTD12 citations74
US4110781AAug 29, 1978
Bidirectional grooved thyristor fired by activation of the beveled surfaces
HITACHI LTD13 citations74
US4016592AApr 5, 1977
Light-activated semiconductor-controlled rectifier
HITACHI LTD13 citations74
US3978514AAug 31, 1976
Diode-integrated high speed thyristor
HITACHI LTD16 citations74
US3967308AJun 29, 1976
Semiconductor controlled rectifier
HITACHI LTD9 citations74
US6180959B1Jan 30, 2001
Static induction semiconductor device, and driving method and drive circuit thereof
HITACHI LTD12 citations73
US4542398ASep 17, 1985
Semiconductor devices of multi-emitter type
HITACHI LTD16 citations73
US4691223ASep 1, 1987
Semiconductor device having high breakdown voltage
HITACHI LTD19 citations72
US3947864AMar 30, 1976
Diode-integrated thyristor
HITACHI LTD19 citations71
US5324967AJun 28, 1994
Turn off type semiconductor device, method of producing the same and the power conversion apparatus employing the same
HITACHI LTD11 citations70
US6384428B1May 7, 2002
Silicon carbide semiconductor switching device
HITACHI LTD10 citations69
US5831293ANov 3, 1998
Semiconductor thyristor switching device and power converter using same
HITACHI LTD3 citations63
US4682199AJul 21, 1987
High voltage thyristor with optimized doping, thickness, and sheet resistivity for cathode base layer
HITACHI LTD6 citations63
US4651189AMar 17, 1987
Semiconductor device provided with electrically floating control electrode
HITACHI LTD3 citations63
US4646122AFeb 24, 1987
Semiconductor device with floating remote gate turn-off means
HITACHI LTD3 citations63
US4240091ADec 16, 1980
Semiconductor controlled rectifier device with small area dV/dt self-protecting means
HITACHI LTD6 citations63
US3943550AMar 9, 1976
Light-activated semiconductor-controlled rectifier
HITACHI LTD2 citations63
US4825270AApr 25, 1989
Gate turn-off thyristor
HITACHI LTD4 citations60
US4028721AJun 7, 1977
Semiconductor controlled rectifier device
HITACHI LTD4 citations60
US4404580ASep 13, 1983
Light activated semiconductor device
HITACHI LTD1 citations52
US6750477B2Jun 15, 2004
Static induction transistor
HITACHI LTD0 citations51
NAT INST OF ADVANCED IND SCIEN
4 patentsUS8003991B2Aug 23, 2011
Silicon carbide MOS field effect transistor with built-in Schottky diode and method for fabrication thereof
NAT INST OF ADVANCED IND SCIEN10 citations84
US7880173B2Feb 1, 2011
Semiconductor device and method of manufacturing same
NAT INST OF ADVANCED IND SCIEN7 citations84
US7728336B2Jun 1, 2010
Silicon carbide semiconductor device and method for producing the same
NAT INST OF ADVANCED IND SCIEN7 citations74
US7811874B2Oct 12, 2010
Method for manufacturing silicon carbide semiconductor device, and silicon carbide semiconductor device
NAT INST OF ADVANCED IND SCIEN6 citations62